The Gradient panel's colour chip opens the stop popover on a click. The
popover closes on a click elsewhere, and the opening click itself, which
is released in the frame the popover first draws and lies outside it,
counted as one: the popover closed at once (a double-click got through,
as the popover lets the double-click that opens it from the canvas pass).
The popover now records the frame it first drew in and only a click in a
later frame closes it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>