[JBIDE-19292] Closing Central right after JBDS startup SWTException #322
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Fix moves update code in UI thread and relive editor from
finding current display. UIJob will find current display
for running workspace and call runInUIThred method inside
runnable passed to display.asyncExec() method. updateTitle()
method itself is safe to run when Central editor is closed, because
it has all isDisposed() checks for involved widgets.