iced_aw's DropDown keeps its list on screen by testing it against the
viewport's width and height only, as if the viewport started at the
window corner. Inside a scrollable the viewport is the visible area in
window coordinates, so a field in a dock pallet saw its list overflow
and the list jumped left by its own width (or up over the field); the
Properties Transparency dropdown showed it. Hand the drop-down a
viewport reaching from the corner to the visible area's far edges.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_014ihuqzxdUhd9UbioPn5MGu
