In a window too short for them, the toolbar (tools, Fill/Stroke, colour
chips, drawing modes, Screen Mode, Edit Toolbar) and the dock's panel icon
column scroll with the mouse wheel, or with the scroll bar that shows while
the pointer is over them, instead of being cut off at the hint bar.
Root cause: both were drawn straight into their side panels with no scroll
area, and the toolbar's only fallback (two columns) runs out below about
760 pt. They now draw inside widgets::strip_scroll, a vertical ScrollArea
next to the menus' widgets::menu_scroll.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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