Fix #916 (Lite) — Memory tab tooltip stops working after returning to tab#921
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erikdarlingdata merged 1 commit intodevfrom May 2, 2026
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… tab Mirrors Dashboard fix in 4e58e8a. WPF Popup with PlacementTarget = chart can wedge when the user navigates away from a TabItem mid-hover: WPF unloads the parent without firing MouseLeave on the chart, so _popup.IsOpen stays true with a stale anchor. On return, OnMouseMove sets IsOpen = true but it is already true — the assignment is a no-op and the popup never re-anchors or appears. Lite has the same nested TabControl pattern (parent Memory tab hosting Memory Overview / Memory Clerks / Memory Grants / Memory Pressure Events sub-tabs) so the bug surfaces the same way. - Force _popup.IsOpen = false on chart Loaded / Unloaded / IsVisibleChanged. - In OnMouseMove, toggle IsOpen off then on so WPF re-evaluates placement even when the popup believes it is already open. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Popup(used by Lite'sChartHoverHelper) can wedge when the user navigates away from aTabItemmid-hover: WPF unloads the parent without firingMouseLeave, soIsOpenstaystruewith a stale placement anchor. On return,OnMouseMovesetsIsOpen = trueagain, but since it's alreadytruethe assignment is a no-op and the popup never re-anchors or appears.Loaded/Unloaded/IsVisibleChanged, and toggleIsOpenoff→on insideOnMouseMoveso WPF re-evaluates placement even when the popup believes it's already open.Related to #916
Test plan
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