The right-click menu was pinned to the screen's bottom-left corner.
Each layout tab now records its screen bounds through a PosReport
wrapper (which learned runtime-built ids for the dynamic tab names),
and the menu anchors next to the clicked tab via the shared
status-bar popup positioning, falling back to the left edge only when
no bounds were recorded (#428).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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