Notify the tab bar or docking system that a tab was closed.
tab_or_docked_window_label
Label identifying the tab being closed, submitted before the tab bar or its remaining tabs.
notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars).
For tab-bar: call after BeginTabBar() and before Tab submissions.
Otherwise call with a window name.
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Notify the tab bar or docking system that a tab was closed.