sidebar: a status can have more than one row (tab_bar_status_lines)

Sixteen cells is not enough for a sentence, and a sentence is what a pane
has to say: "add a summary…" is most of a status and none of its meaning.
tab_bar_status_lines 3 word-wraps instead of cutting, and the same column
carries forty-eight cells rather than sixteen.

Wrapped, the rows under a tab stop being a list of panes and become a
paragraph each, so the shape no longer says where one pane's status ends and
the next begins -- both are italic text down one column. Alternate panes are
drawn on alternate bands to say it instead: tab_status_stripe, derived from
the theme like tab_status_fg, so a theme that has never heard of any of this
still gets a band in its own family. Nothing is painted at one line, where
there is no ambiguity to resolve and a band would take a translucent
terminal's background away for nothing.

1 is the default and is the old behaviour exactly, down to cutting at the
column rather than the last word before it: with no next row to move the word
to, breaking early would spend cells on nothing. The reason to prefer a word
boundary only exists once there is somewhere for the word to go.

Rows count against tab_bar_status as before, so wrapping trades panes for
words within the same allowance, and the allowance itself still gives way to
the tabs. A status that will not fit whole is dropped whole and reported with
the ellipsis, rather than shown as a fragment that reads like the whole
thing. Every row of a status is the same `find:` door.

tabstatus's buffer goes to 256 to match pane_status's own slot: at one line
the drawing cut it anyway, but wrapped it is the whole string that has to
survive the trip.

3 files changed, 26 insertions, 3 deletions

diff --git a/docs/config.md b/docs/config.md
index 0da27a6..6fa0300 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -83,7 +83,7 @@ theme { frame_focus "#00ff88" }     // ...but that one colour is mine
 | group     | what is in it                                                                                                                                                                                                                                                                      |
 | --------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | geometry  | `gap` `gap_aspect` `padding` `compact` `rounded` `title_align` `title_inset` `min_pane` `min_split`                                                                                                                                                                                |
-| chrome    | `status_bar` `status_line` `status_pad` `tab_bar_side` `tab_bar_width` `tab_bar_pad` `tab_bar_status` `tab_bar_chrome` `hints` `version_banner` `pane_buttons` `bell_indicator` `newtab_button` `newtab_pad` and the marks (`zoom_mark` `zoom_on_mark` `close_mark` `min_mark` `newtab_mark` `bell_mark`)                        |
+| chrome    | `status_bar` `status_line` `status_pad` `tab_bar_side` `tab_bar_width` `tab_bar_pad` `tab_bar_status` `tab_bar_status_lines` `tab_bar_chrome` `hints` `version_banner` `pane_buttons` `bell_indicator` `newtab_button` `newtab_pad` and the marks (`zoom_mark` `zoom_on_mark` `close_mark` `min_mark` `newtab_mark` `bell_mark`)                        |
 | behaviour | `focus_follows_mouse` `ctrl_d_exits` `scroll_lines` `scrollback` `scrollback_bytes` `toast_ms` `splash_ms` `hover_delay_ms` `double_click_ms` `word_separators` `anim_ms` `modal_scrim` `dim_unfocused` `float_shadow` `keep_dead` `in_band_shaders` `multi_attach` `attach_indicator` `size_follows` `shell` `editor` |
 | projects  | `project_roots` `project_layout` (see [workspaces](workspaces.md))                                                                                                                                                                                                                 |
 | colour    | `theme { }`                                                                                                                                                                                                                                                                        |
diff --git a/docs/panes.md b/docs/panes.md
index 9e437a2..6cc1055 100644
--- a/docs/panes.md
+++ b/docs/panes.md
@@ -57,6 +57,7 @@ tab_bar_side "left"   // or "right"; "top" is the default
 tab_bar_width 18      // columns the sidebar takes
 tab_bar_pad 0         // blank rows above the first tab
 tab_bar_chrome true   // frame it like a pane
+tab_bar_status_lines 1 // rows one status may wrap onto
 newtab_button true    // the `+` at the end of the list
 newtab_pad 1          // ...and the air before it
 ```
@@ -92,7 +93,18 @@ and the last row is an ellipsis rather than a status pretending the list is
 complete. A short terminal cuts the list the same way, and says so the same
 way: **the statuses give way before the tabs do**, because the list is how you
 navigate and a status is only an annotation on it — a talkative pane must not
-be able to cost you a tab you can click. **Clicking a status row jumps to the
+be able to cost you a tab you can click.
+
+**A status can be given more than one row.** `tab_bar_status_lines 3` word-wraps
+it instead of cutting it, which is the difference between `add a summary…` and
+the sentence — three rows of a sixteen-column sidebar is forty-eight cells. The
+rows under a tab then read as a paragraph per pane rather than a line per pane,
+so **alternate panes sit on alternate bands** (`tab_status_stripe`, derived from
+the theme unless you name it): with the shape no longer saying where one pane's
+status ends, the band does. At one line there is nothing to disambiguate and no
+band is drawn, which leaves a translucent terminal's own background alone. Every
+row of a status is the same door — clicking any of them jumps to that pane — and
+they all count against `tab_bar_status`. **Clicking a status row jumps to the
 pane that said it**, across tabs. A status is set in italic rather than indented under its tab — the slant
 says "this belongs to the row above" without spending columns a narrow sidebar
 has none of, and says it on a monochrome theme too. The colour is part way
diff --git a/docs/slosh.5 b/docs/slosh.5
index ec2d6fe..7fdd146 100644
--- a/docs/slosh.5
+++ b/docs/slosh.5
@@ -147,7 +147,18 @@ labels.
 Under each of a sidebar's tabs, up to \fIn\fR rows of what the panes inside
 said through OSC 5577 status \(em or how they died \(em with an ellipsis when
 there was more. Clicking a status row jumps to the pane that said it.
-0 turns it off; \fBtop\fR has no room for it either way.
+0 turns it off; \fBtop\fR has no room for it either way. The statuses give
+way before the tabs do when the sidebar is short of rows: the list is how you
+navigate, and a talkative pane must not cost you a tab you can click.
+.TP
+.BI tab_bar_status_lines\  n
+How many rows one pane's status may wrap onto, rather than being cut at the
+sidebar's width. 1, the default, is a single truncated row. Above that the
+text is word-wrapped \(em three rows of a sixteen-column sidebar is
+forty-eight cells rather than sixteen \(em and alternate panes are drawn on
+alternate bands (\fBtab_status_stripe\fR), because wrapped rows are a
+paragraph per pane and the shape alone no longer says where one ends. Rows
+still count against \fBtab_bar_status\fR.
 .TP
 .BI hints\  bool
 What the pointer is resting on, said in the status line.