feat(ui): overhauled resize and layout systems

* refactor(panes): move to parametric pane sizes

* Fixed the simpler errors by casting to usize

* The least I can do is pass the formatting check...

* Move to stable toolchain

* Well, it compiles?

* And now it doesn't! ;)

* Baseline functionality with the new Dimension type

* Working POC for percent-based resizing

* REVERT THIS COMMIT – DELETES TESTS

* Perfected the discrete resize algorithm

* Fixed fixed-size panes

* Basic bidirectional resize

* feat(resize): finalised parametric resize algorithm

* Reduce the logging level a bit

* Fixed nested layouts using percents

* Bug squishing for implicit sizing

* Here is a funky (read: rubbish) rounding approach

* And now it's gone again!

* Improve discretisation algorithm to fix rounding errors

* Fix the last layout bug (maybe?)

* Mixed explicit and implied percents work now

* Let's pretend that didn't happen...

* Make things a bit less crashy

* Crash slightly more for now (to find bugs)

* Manaually splitting of panes works now

* Start moving to percent-based resizes

* Everything but fullscreen seems to be working

* Fix compilatation errors

* Culled a massive amount of border code

* Why not pause to please rustfmt?

* Turns out I was still missing a few tests...

* Bringing back even more tests!

* Fix tests and pane boarders

* Fix the resize system without gaps

* Fix content offset

* Fixed a bug with pane closing

* Add a hack to fix setting of the viewport

* Fix toggling between shared borders and frames

* fix(tests): make e2e properly use PaneGeom

* style(fmt): make rustfmt happy

* Revert unintentional rounding of borders

* Purge some old borderless stuff

* Fix busted tab-bar shrinking

* Update E2E tests

* Finish implementing fullscreen!

* Don't crash anymore?

* Fix (almost) all tests

* Fix a lack of tab-stops

* All tests passing

* I really can't be bothered to debug a CI issue

* Tie up loose ends

* Knock out some lingering FIXMEs

* Continue to clean things up

* Change some naming and address FIXMEs

* Cull more code + FIXMEs

* Refactor of the resize system + polish

* Only draw frames when absolutely necessary

* Fix the tab-bar crash

* Fix rendering of boarders on reattach

* Fix resizing at small pane sizes

* Deduplicate code in the layout system

* Update tab-bar WASM

* Fixed the pinching of panes during resize

* Unexpose needlessly public type

* Add back a lost test

* Re-add tab tests and get them to compile

* All tabs need layouts

* Start fixing tests + bug in main

* Stabilize the resize algorithm rounding

* All tests from main are now passing

* Cull more dead code

2 files changed, 27 insertions, 19 deletions

diff --git a/default-plugins/tab-bar/src/line.rs b/default-plugins/tab-bar/src/line.rs
index fc18abfd1..b92f7573a 100644
--- a/default-plugins/tab-bar/src/line.rs
+++ b/default-plugins/tab-bar/src/line.rs
@@ -5,9 +5,7 @@ use zellij_tile::prelude::*;
 use zellij_tile_utils::style;
 
 fn get_current_title_len(current_title: &[LinePart]) -> usize {
-    current_title
-        .iter()
-        .fold(0, |acc, title_part| acc + title_part.len)
+    current_title.iter().map(|p| p.len).sum()
 }
 
 fn populate_tabs_in_tab_line(
@@ -144,20 +142,29 @@ fn add_next_tabs_msg(
     title_bar.push(right_more_message);
 }
 
-fn tab_line_prefix(session_name: Option<&str>, palette: Palette) -> LinePart {
-    let mut prefix_text = " Zellij ".to_string();
-    if let Some(name) = session_name {
-        prefix_text.push_str(&format!("({}) ", name));
-    }
+fn tab_line_prefix(session_name: Option<&str>, palette: Palette, cols: usize) -> Vec<LinePart> {
+    let prefix_text = " Zellij ".to_string();
 
     let prefix_text_len = prefix_text.chars().count();
     let prefix_styled_text = style!(palette.white, palette.cyan)
         .bold()
         .paint(prefix_text);
-    LinePart {
+    let mut parts = vec![LinePart {
         part: format!("{}", prefix_styled_text),
         len: prefix_text_len,
+    }];
+    if let Some(name) = session_name {
+        let name_part = format!("({}) ", name);
+        let name_part_len = name_part.chars().count();
+        let name_part_styled_text = style!(palette.white, palette.cyan).bold().paint(name_part);
+        if cols.saturating_sub(prefix_text_len) >= name_part_len {
+            parts.push(LinePart {
+                part: format!("{}", name_part_styled_text),
+                len: name_part_len,
+            })
+        }
     }
+    parts
 }
 
 pub fn tab_separator(capabilities: PluginCapabilities) -> &'static str {
@@ -176,7 +183,7 @@ pub fn tab_line(
     palette: Palette,
     capabilities: PluginCapabilities,
 ) -> Vec<LinePart> {
-    let mut tabs_to_render: Vec<LinePart> = vec![];
+    let mut tabs_to_render = Vec::new();
     let mut tabs_after_active = all_tabs.split_off(active_tab_index);
     let mut tabs_before_active = all_tabs;
     let active_tab = if !tabs_after_active.is_empty() {
@@ -184,14 +191,17 @@ pub fn tab_line(
     } else {
         tabs_before_active.pop().unwrap()
     };
-    tabs_to_render.push(active_tab);
+    let mut prefix = tab_line_prefix(session_name, palette, cols);
+    let prefix_len = get_current_title_len(&prefix);
+    if prefix_len + active_tab.len <= cols {
+        tabs_to_render.push(active_tab);
+    }
 
-    let prefix = tab_line_prefix(session_name, palette);
     populate_tabs_in_tab_line(
         &mut tabs_before_active,
         &mut tabs_after_active,
         &mut tabs_to_render,
-        cols.saturating_sub(prefix.len),
+        cols.saturating_sub(prefix_len),
     );
 
     let mut tab_line: Vec<LinePart> = vec![];
@@ -200,7 +210,7 @@ pub fn tab_line(
             &mut tabs_before_active,
             &mut tabs_to_render,
             &mut tab_line,
-            cols.saturating_sub(prefix.len),
+            cols.saturating_sub(prefix_len),
             palette,
             tab_separator(capabilities),
         );
@@ -210,11 +220,11 @@ pub fn tab_line(
         add_next_tabs_msg(
             &mut tabs_after_active,
             &mut tab_line,
-            cols.saturating_sub(prefix.len),
+            cols.saturating_sub(prefix_len),
             palette,
             tab_separator(capabilities),
         );
     }
-    tab_line.insert(0, prefix);
-    tab_line
+    prefix.append(&mut tab_line);
+    prefix
 }
diff --git a/default-plugins/tab-bar/src/main.rs b/default-plugins/tab-bar/src/main.rs
index a185ccc33..3256c13c2 100644
--- a/default-plugins/tab-bar/src/main.rs
+++ b/default-plugins/tab-bar/src/main.rs
@@ -25,8 +25,6 @@ register_plugin!(State);
 impl ZellijPlugin for State {
     fn load(&mut self) {
         set_selectable(false);
-        set_invisible_borders(true);
-        set_fixed_height(1);
         subscribe(&[EventType::TabUpdate, EventType::ModeUpdate]);
     }