Bug 326340 [Workbench] Removing recent workspaces doesn't remove them from the "Switch Workspace" menu
If I remove recent workspaces from Preferences>General>Startup and Shutdown>Workspaces, they are not removed from the File>Switch Workspace menu. This would appear to be an oversight.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/actions/OpenWorkspaceAction.java
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