Fix icon sizing.

README.md

@@ -379,6 +379,11 @@ in principle, but a terminal grid is small.
   its pane count once a view holds more than one
 - Tabs: create, close, switch, and reorder by dragging a sidebar row, with the
   rows shuffling live as you drag; closing the last one closes the window
+- **A resizable sidebar**: the gutter beside it is a real divider, so drag it
+  to taste. Dragging it all the way in — or `Ctrl+Shift+S`, or the chevron at
+  the sidebar's foot — collapses the column to just each tab's emoji or icon
+  (hover a row for its name; the status bar and wash still show); the same
+  toggle expands it back to the width it had
 - Multiple panes per tab in an arbitrary split tree, rearranged by keyboard
   or by dragging a pane's header, with draggable dividers between them;
   closing the last pane in a view closes its tab
@@ -432,6 +437,7 @@ in principle, but a terminal grid is small.
 | `Ctrl+Shift+C` | copy the terminal selection | `copy` |
 | `Ctrl+Shift+R` | rename the current tab (empty name = follow the terminal) | `rename_tab` |
 | `Ctrl+Shift+Z`, `Ctrl+Shift+F` | zoom the focused pane to fill the tab, and back | `toggle_zoom` |
+| `Ctrl+Shift+S` | collapse the sidebar to its emoji column, and back | `toggle_sidebar` |
 | `Ctrl+F` | find in the focused web page (web panes only — see [Find in page](#find-in-page)) | `find` |
 | `Ctrl+,` | settings | `open_settings` |
 | `Ctrl+PageUp/PageDown`, `Alt+Shift+K/J` | previous / next tab | `prev_tab`, `next_tab` |