On the in-window menu bar (Windows and Linux) each top-level menu needed
its own click: with File open, moving the pointer onto Edit or Object did
nothing. Now, as on a native menu bar, while one menu is open a moving
pointer that reaches another title opens that menu instead (ported from
PhotoCraft). A pointer resting on a title doesn't switch, and a tall menu
that covers the bar doesn't switch to the title underneath it. The native
macOS menu bar is unchanged.
Also adds a regression test for #292: the Simplify, Offset Path, Move,
Rotate, Split Into Grid and Average dialogs are 366 pt wide in a 1600 pt
window (already fixed by #239).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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