more shrink, and a + t2

Asset/css/shrink-vertically.css

@@ -13,12 +13,12 @@
  * breathing room). A fixed-px budget is more reliable than a proportional vh value
  * because that chrome is a fixed height regardless of screen size.
  *
- * Tune the single number below (120px) if the scrollbar is still clipped or if you
+ * Tune the single number below (170px) if the scrollbar is still clipped or if you
  * want the columns taller.
  *
  * The selector is intentionally more specific than core's single-class rule, and
  * uses !important, so this override wins even alongside a theme (e.g. Essential).
  */
 #board td .board-task-list.board-task-list-compact {
-    max-height: calc(100vh - 120px) !important;
+    max-height: calc(100vh - 170px) !important;
 }

Plugin.php

@@ -13,6 +13,12 @@ class Plugin extends Base
         $this->hook->on('template:layout:css', array(
             'template' => 'plugins/ShrinkVertically/Asset/css/shrink-vertically.css',
         ));
+
+        // Append a "+" to the two vertical-collapse menu labels so it is visible
+        // that the behaviour is modified by this plugin.
+        $this->hook->on('template:layout:js', array(
+            'template' => 'plugins/ShrinkVertically/Asset/js/shrink-vertically.js',
+        ));
     }
 
     public function getPluginName()

README.md

@@ -25,16 +25,23 @@ list:
 
 ```css
 #board td .board-task-list.board-task-list-compact {
-    max-height: calc(100vh - 120px) !important;
+    max-height: calc(100vh - 170px) !important;
 }
 ```
 
-The `120px` reserves room for the page header, the board column header, the horizontal
+The `170px` reserves room for the page header, the board column header, the horizontal
 scrollbar, and a little breathing space. A fixed-pixel budget is more reliable than a
 proportional value because that chrome is a fixed height regardless of screen size.
 
-It changes nothing else: no data, no JavaScript, no database migration. The override only
+The override only applies while columns are collapsed (when core adds the
-applies while columns are collapsed (when core adds the `board-task-list-compact` class).
+`board-task-list-compact` class). It changes no data and runs no database migration.
+
+## Menu labels
+
+So it is obvious the collapsed behaviour comes from this plugin and not from core, a
+small script (via `template:layout:js`) appends a `+` to the two gear-menu items, so they
+read "Collapse vertically+" and "Expand vertically+". It only edits the rendered link
+text, so it works in any locale.
 
 ## Requirements
 
@@ -48,7 +55,7 @@ from the folder name). Reload the board; no build step, no configuration.
 
 ## Tuning
 
-Edit the single `120px` value in `Asset/css/shrink-vertically.css`. Increase it if the
+Edit the single `170px` value in `Asset/css/shrink-vertically.css`. Increase it if the
 scrollbar is still clipped (for example with a taller theme header); decrease it to make
 the collapsed columns taller.