The handles are invisible and paint above the frame, so the north strip ran the
full window width across the caption buttons and the north-east square sat on
the close button's own top-right corner. Crossing one dropped that button's
:hover mid-glow, which reads as the Aero glow flickering or sticking — an
artifact with nothing wrong in the CSS at all.
Only the bottom-right corner overlaps nothing: it lands in the 6px gutter that
.window-body's margin leaves below and right of the content. That is also where
Win7 put its own resize gripper, so one grip is the more faithful answer anyway.
Bumped to 1rem from 0.75rem since it is now the only way to resize.
resizeFrame stays general and the probe still exercises all eight edges: the
origin-moving cases are the subtle ones and are worth keeping proven, so
restoring a side later is one entry in the component against tested math. Both
the component and gotchas.md now spell out which edges are safe to restore
(south, east, west) and which are not (north and both top corners).
Harness diffs 0; math, hover and menu probes clean.
Co-Authored-By: Claude <noreply@anthropic.com>
jgamboaandClaude
0a0c708140