The tab strip decided the close gesture from the `uncloseable` flag, which the
workspace sets to keep its pane in the tree — so the one tab whose close now
does something couldn't be ⌘-clicked or middle-clicked, and its right-click
menu had no Close.
Read the gesture off the pane's registered closer instead, with the workspace
registering closeWorkspaceTab. An atom rather than a lookup, since that closer
comes from a wiring effect that lands after the strip's first paint.
Brooklyn Nicholson
193e5f84f7