taskmanager: Fix blank space and highlight residue in ToolTipInstance
This commit fixes two bugs and make ToolTipInstance really reusable: 1. Open 3 or more windows of an app, then close the last of them. The tooltip remains the same size with a blank space where the closed app's thumbnail used to be. 2. The highlight will remain if an instance closed by middle click is reused.
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06d3c250
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