In the Fill or Stroke chip's popover (Control bar, Properties ›
Appearance), the Swatch Libraries Menu button at the foot of the
swatches closed the popover and showed nothing, as in the video on
#536; Show Swatch Kinds did the same. egui remembers one open popup per
window: the chip's popover was such a remembered popup, so the button's
menu, opening as another one, closed the popover and itself with it.
The popover now keeps its own open state with widgets::popover (made for
popovers that open menus of their own), so the libraries menu opens over
it and a library chosen there opens in the library panel. Escape, a
click outside and a click on the chip still close it.
Test: tests_paintchips::the_popover_swatch_libraries_button_opens_the_libraries_menu
(fails before this change: the popover closes).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01K3vVft4VXvvy8SpbbUceTW
