feat(scrolling): basic 1-line scroll-up and scroll-down inside a pane

14 files changed, 358 insertions, 5 deletions

diff --git a/src/main.rs b/src/main.rs
index 70f3d69f..c6a77e2a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -121,6 +121,15 @@ pub fn start(mut os_input: Box<dyn OsApi>) {
                             ScreenInstruction::MoveFocus => {
                                 screen.move_focus();
                             }
+                            ScreenInstruction::ScrollUp => {
+                                screen.scroll_active_terminal_up();
+                            }
+                            ScreenInstruction::ScrollDown => {
+                                screen.scroll_active_terminal_down();
+                            }
+                            ScreenInstruction::ClearScroll => {
+                                screen.clear_active_terminal_scroll();
+                            }
                             ScreenInstruction::Quit => {
                                 break;
                             }
@@ -152,8 +161,13 @@ pub fn start(mut os_input: Box<dyn OsApi>) {
             send_screen_instructions.send(ScreenInstruction::Quit).unwrap();
             send_pty_instructions.send(PtyInstruction::Quit).unwrap();
             break;
+        } else if buffer[0] == 27 { // ctrl-[
+            send_screen_instructions.send(ScreenInstruction::ScrollUp).unwrap();
+        } else if buffer[0] == 29 { // ctrl-]
+            send_screen_instructions.send(ScreenInstruction::ScrollDown).unwrap();
         } else {
             // println!("\r buffer {:?}   ", buffer[0]);
+            send_screen_instructions.send(ScreenInstruction::ClearScroll).unwrap();
             send_screen_instructions.send(ScreenInstruction::WriteCharacter(buffer[0])).unwrap();
         }
     };
diff --git a/src/screen.rs b/src/screen.rs
index f35f1072..0c68bfa4 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -58,6 +58,9 @@ pub enum ScreenInstruction {
     ResizeUp,
     MoveFocus,
     Quit,
+    ScrollUp,
+    ScrollDown,
+    ClearScroll,
 }
 
 pub struct Screen {
@@ -823,4 +826,27 @@ impl Screen {
         }
         self.render();
     }
+    pub fn scroll_active_terminal_up(&mut self) {
+        if let Some(active_terminal_id) = self.get_active_terminal_id() {
+            let active_terminal = self.terminals.get_mut(&active_terminal_id).unwrap();
+            active_terminal.scroll_up(1);
+            self.render();
+        }
+    }
+    pub fn scroll_active_terminal_down(&mut self) {
+        if let Some(active_terminal_id) = self.get_active_terminal_id() {
+            let active_terminal = self.terminals.get_mut(&active_terminal_id).unwrap();
+            active_terminal.scroll_down(1);
+            self.render();
+        }
+    }
+    pub fn clear_active_terminal_scroll(&mut self) {
+        if let Some(active_terminal_id) = self.get_active_terminal_id() {
+            let active_terminal = self.terminals.get_mut(&active_terminal_id).unwrap();
+            if active_terminal.scroll_up_count.is_some() {
+                active_terminal.clear_scroll();
+                self.render();
+            }
+        }
+    }
 }
diff --git a/src/terminal_pane.rs b/src/terminal_pane.rs
index bbbe7208..fbdb1428 100644
--- a/src/terminal_pane.rs
+++ b/src/terminal_pane.rs
@@ -481,6 +481,7 @@ pub struct TerminalOutput {
     pub display_rows: u16,
     pub display_cols: u16,
     pub should_render: bool,
+    pub scroll_up_count: Option<usize>,
     pub x_coords: u16,
     pub y_coords: u16,
     cursor_position: usize,
@@ -539,6 +540,7 @@ impl TerminalOutput {
             display_rows: ws.ws_row,
             display_cols: ws.ws_col,
             should_render: true,
+            scroll_up_count: None,
             reset_foreground_ansi_code: false,
             reset_background_ansi_code: false,
             reset_misc_ansi_code: false,
@@ -713,6 +715,8 @@ impl TerminalOutput {
         let mut next_newline_index = newline_indices.next();
         let mut next_linebreak_index = linebreak_indices.next();
 
+        let mut scroll_up_count = self.scroll_up_count.unwrap_or(0);
+
         loop {
             if let Some(newline_index) = next_newline_index {
                 if *newline_index == i {
@@ -720,7 +724,12 @@ impl TerminalOutput {
                     for _ in current_line.len()..self.display_cols as usize {
                         current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
                     }
-                    output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    if scroll_up_count > 0 {
+                        scroll_up_count -= 1;
+                        current_line.clear();
+                    } else {
+                        output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    }
                     next_newline_index = newline_indices.next();
                     continue; // we continue here in case there's another new line in this index
                 }
@@ -732,7 +741,12 @@ impl TerminalOutput {
                         for _ in current_line.len()..self.display_cols as usize {
                             current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
                         }
-                        output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                        if scroll_up_count > 0 {
+                            scroll_up_count -= 1;
+                            current_line.clear();
+                        } else {
+                            output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                        }
                     }
                     next_linebreak_index = linebreak_indices.next();
                     continue; // we continue here in case there's another new line in this index
@@ -743,7 +757,12 @@ impl TerminalOutput {
                     for _ in current_line.len()..self.display_cols as usize {
                         current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
                     }
-                    output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    if scroll_up_count > 0 {
+                        scroll_up_count -= 1;
+                        current_line.clear();
+                    } else {
+                        output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    }
                 }
                 break;
             }
@@ -755,7 +774,12 @@ impl TerminalOutput {
                     for _ in current_line.len()..self.display_cols as usize {
                         current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
                     }
-                    output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    if scroll_up_count > 0 {
+                        scroll_up_count -= 1;
+                        current_line.clear();
+                    } else {
+                        output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
+                    }
                 }
                 break;
             }
@@ -767,7 +791,12 @@ impl TerminalOutput {
                 empty_line.push(&EMPTY_TERMINAL_CHARACTER);
             }
             for _ in output.len()..self.display_rows as usize {
-                output.push_back(Vec::from(empty_line.clone()));
+                if scroll_up_count > 0 {
+                    scroll_up_count -= 1;
+                    empty_line.clear(); // TODO: better
+                } else {
+                    output.push_back(Vec::from(empty_line.clone()));
+                }
             }
         }
         Vec::from(output)
@@ -809,6 +838,32 @@ impl TerminalOutput {
         let x = self.cursor_position - current_line_start_index;
         (x, y)
     }
+    pub fn scroll_up(&mut self, count: usize) {
+        if let Some(scroll_up_count) = self.scroll_up_count.as_mut() {
+            *scroll_up_count += count;
+        } else {
+            self.scroll_up_count = Some(count);
+        }
+        // TODO: do not render if we're at the top line
+        self.should_render = true;
+    }
+    pub fn scroll_down(&mut self, count: usize) {
+        if let Some(scroll_up_count) = self.scroll_up_count.as_mut() {
+            if *scroll_up_count > count {
+                *scroll_up_count -= count;
+                self.should_render = true;
+            } else {
+                self.scroll_up_count = None;
+                self.should_render = true;
+            }
+        }
+    }
+    pub fn clear_scroll(&mut self) {
+        if self.scroll_up_count.is_some() {
+            self.should_render = true;
+        }
+        self.scroll_up_count = None;
+    }
     fn index_of_end_of_canonical_line(&self, index_in_line: usize) -> usize {
         let newlines = self.newline_indices.iter().rev();
         let mut index_of_end_of_canonical_line = self.characters.len();
diff --git a/src/tests/integration/basic.rs b/src/tests/integration/basic.rs
index 123f96e6..49cfeda5 100644
--- a/src/tests/integration/basic.rs
+++ b/src/tests/integration/basic.rs
@@ -98,3 +98,21 @@ pub fn resize_right_and_up_on_the_same_axis() {
         assert_snapshot!(snapshot);
     }
 }
+
+#[test]
+pub fn scrolling_inside_a_pane() {
+    let fake_win_size = Winsize { // TODO: combine with above
+        ws_col: 121,
+        ws_row: 20,
+        ws_xpixel: 0,
+        ws_ypixel: 0,
+    };
+    let mut fake_input_output = get_fake_os_input(&fake_win_size);
+    fake_input_output.add_terminal_input(&[2, 14, 27, 27, 29, 29, 17]); // split-horizontally, split-vertically, scroll up twice, scroll down twice and quit (ctrl-b + ctrl+[ * 2 + ctrl+] * 2, ctrl-q)
+    start(Box::new(fake_input_output.clone()));
+    let output_frames = fake_input_output.stdout_writer.output_frames.lock().unwrap();
+    let snapshots = get_output_frame_snapshots(&output_frames, &fake_win_size);
+    for snapshot in snapshots {
+        assert_snapshot!(snapshot);
+    }
+}
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-10.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-10.snap
new file mode 100644
index 00000000..35d762a6
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-10.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line12-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line13-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line14-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line15-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line16-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line17-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line18-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line19-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+prompt $                                                    │prompt $                                                    
+Bye from Mosaic!█                                                                                                        
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-2.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-2.snap
new file mode 100644
index 00000000..9d5857f4
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-2.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+█                                                                                                                        
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
+                                                                                                                         
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-3.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-3.snap
new file mode 100644
index 00000000..de9e6005
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-3.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $ █                                                                                                               
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-4.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-4.snap
new file mode 100644
index 00000000..68ffe27c
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-4.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│█                                                           
+a                                                           │                                                            
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│                                                            
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│                                                            
+a                                                           │                                                            
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│                                                            
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│                                                            
+a                                                           │                                                            
+prompt $                                                    │                                                            
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-5.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-5.snap
new file mode 100644
index 00000000..381b34a9
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-5.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line12-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line13-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line14-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line15-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line16-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line17-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line18-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line19-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+prompt $                                                    │prompt $ █                                                  
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-6.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-6.snap
new file mode 100644
index 00000000..4dc5e2e7
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-6.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line17-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line11-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line12-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line13-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line14-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line15-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line16-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line17-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line18-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+prompt $                                                    │line19-bb█bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-7.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-7.snap
new file mode 100644
index 00000000..111d8757
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-7.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line10-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line11-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line18-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line12-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line13-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line14-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+line19-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line15-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa│line16-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+a                                                           │line17-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+prompt $                                                    │line18-bb█bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-8.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-8.snap
new file mode 100644
index 00000000..4dc5e2e7
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-8.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
+line11-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line12-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line13-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line14-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line15-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+line16-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
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diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-9.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-9.snap
new file mode 100644
index 00000000..381b34a9
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane-9.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
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+prompt $                                                                                                                 
+────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────
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+a                                                           │line19-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+prompt $                                                    │prompt $ █                                                  
diff --git a/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane.snap b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane.snap
new file mode 100644
index 00000000..3d8b7146
--- /dev/null
+++ b/src/tests/integration/snapshots/mosaic__tests__integration__basic__scrolling_inside_a_pane.snap
@@ -0,0 +1,24 @@
+---
+source: src/tests/integration/basic.rs
+expression: snapshot
+---
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+prompt $ █