feat: add configurable tab bar status (#2586)

* feat: show a zoom indicator in the desktop tab bar

Reserve the right edge of the tab row for a ZOOM pill while the
focused pane is zoomed, matching the accent style of the mode bars.
The per-tab Z suffix stays; the pill makes the zoomed state visible
at a glance like tmux's status-right flag.

* feat: optionally show the hostname in the desktop tab bar

Add ui.tab_bar_hostname to display the machine's hostname at the right
edge of the tab row, like tmux's #h in status-right. The value resolves
where the server renders, so remote sessions show the remote host. Off
by default.

* fix: strip control characters from the tab bar hostname

* fix: hide the hostname when it would squeeze out the tab strip

* feat: add configurable tab bar status

* fix: harden tab bar status updates

* fix: terminate tab bar status process trees

* fix: disable status commands on unsupported platforms

* fix: skip unchanged status command renders

* fix: keep tab bar status opt-in by default

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ui.rs b/src/ui.rs
index 60143fe4..81964422 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -96,7 +96,7 @@ pub(crate) use self::{
     },
     panes::{apply_pane_chrome, pane_inner_rect, pane_is_scrolled_back},
     tab_surface::{tab_surface_cursor, tab_surface_hyperlinks, TabSurfaceView},
-    tabs::compute_tab_bar_view,
+    tabs::{compute_tab_bar_view, tab_bar_content_area},
     widgets::{centered_popup_rect, modal_stack_areas},
 };
 use crate::app::state::ViewLayout;
@@ -267,7 +267,7 @@ fn compute_view_internal(
         .map(|ws| {
             compute_tab_bar_view(
                 ws,
-                tab_bar_rect,
+                tab_bar_content_area(app, tab_bar_rect),
                 app.tab_scroll,
                 app.tab_scroll_follow_active,
                 app.mouse_capture,