feat(panes): `FocusLastPane` action (#4241)

* feat(panes): focus last pane (#4142)

* add tests

* add client id parameter to `add_floating_pane`

* add action for floating panes

* add tests for floating panes

* add keybinds to configs

* rebase fixes

* simplify focus logic when adding stacked pane

* formatting fix

* formatting fix 2

* fix: make sure expanding pane always focuses it for all clients in stack

* add pr

* fix rebase

---------

Co-authored-by: Aram Drevekenin <aram@poor.dev>

4 files changed, 20 insertions, 0 deletions

diff --git a/zellij-utils/src/plugin_api/action.proto b/zellij-utils/src/plugin_api/action.proto
index 7eedf393..68c859b8 100644
--- a/zellij-utils/src/plugin_api/action.proto
+++ b/zellij-utils/src/plugin_api/action.proto
@@ -493,6 +493,7 @@ enum ActionName {
     SetDarkTheme = 101;
     SetLightTheme = 102;
     ToggleTheme = 103;
+    FocusLastPane = 104;
 }
 
 message Position {
diff --git a/zellij-utils/src/plugin_api/action.rs b/zellij-utils/src/plugin_api/action.rs
index 34b3adce..f4e35d84 100644
--- a/zellij-utils/src/plugin_api/action.rs
+++ b/zellij-utils/src/plugin_api/action.rs
@@ -168,6 +168,10 @@ impl TryFrom<ProtobufAction> for Action {
                 Some(_) => Err("FocusPreviousPane should not have a payload"),
                 None => Ok(Action::FocusPreviousPane),
             },
+            Some(ProtobufActionName::FocusLastPane) => match protobuf_action.optional_payload {
+                Some(_) => Err("FocusLastPane should not have a payload"),
+                None => Ok(Action::FocusLastPane),
+            },
             Some(ProtobufActionName::SwitchFocus) => match protobuf_action.optional_payload {
                 Some(_) => Err("SwitchFocus should not have a payload"),
                 None => Ok(Action::SwitchFocus),
@@ -1173,6 +1177,10 @@ impl TryFrom<Action> for ProtobufAction {
                 name: ProtobufActionName::FocusPreviousPane as i32,
                 optional_payload: None,
             }),
+            Action::FocusLastPane => Ok(ProtobufAction {
+                name: ProtobufActionName::FocusLastPane as i32,
+                optional_payload: None,
+            }),
             Action::SwitchFocus => Ok(ProtobufAction {
                 name: ProtobufActionName::SwitchFocus as i32,
                 optional_payload: None,
diff --git a/zellij-utils/src/plugin_api/plugin_command.proto b/zellij-utils/src/plugin_api/plugin_command.proto
index c65bcbfd..82f4d835 100644
--- a/zellij-utils/src/plugin_api/plugin_command.proto
+++ b/zellij-utils/src/plugin_api/plugin_command.proto
@@ -213,6 +213,7 @@ enum CommandName {
   NewTabUnfocused = 220;
   NewTiledPaneInTab = 221;
   ExitMobileMode = 222;
+  FocusLastPane = 223;
 }
 
 message PluginCommand {
diff --git a/zellij-utils/src/plugin_api/plugin_command.rs b/zellij-utils/src/plugin_api/plugin_command.rs
index 42b0774f..546c3586 100644
--- a/zellij-utils/src/plugin_api/plugin_command.rs
+++ b/zellij-utils/src/plugin_api/plugin_command.rs
@@ -980,6 +980,12 @@ impl TryFrom<ProtobufPluginCommand> for PluginCommand {
                 }
                 Ok(PluginCommand::FocusPreviousPane)
             },
+            Some(CommandName::FocusLastPane) => {
+                if protobuf_plugin_command.payload.is_some() {
+                    return Err("FocusLastPane should not have a payload");
+                }
+                Ok(PluginCommand::FocusLastPane)
+            },
             Some(CommandName::MoveFocus) => match protobuf_plugin_command.payload {
                 Some(Payload::MoveFocusPayload(move_payload)) => match move_payload.direction {
                     Some(direction) => Ok(PluginCommand::MoveFocus(direction.try_into()?)),
@@ -3005,6 +3011,10 @@ impl TryFrom<PluginCommand> for ProtobufPluginCommand {
                 name: CommandName::FocusPreviousPane as i32,
                 payload: None,
             }),
+            PluginCommand::FocusLastPane => Ok(ProtobufPluginCommand {
+                name: CommandName::FocusLastPane as i32,
+                payload: None,
+            }),
             PluginCommand::MoveFocus(direction) => Ok(ProtobufPluginCommand {
                 name: CommandName::MoveFocus as i32,
                 payload: Some(Payload::MoveFocusPayload(MovePayload {