Fix issue in IE where the context menu hack might stay visible
Fix issue in IE where the context menu hack might stay visible

Because JS seems to be frozen entirely while the context menu is
open, the next open might happen before the timeout was able to
fire. This forces the previous context menu kludge to be cleared
before starting a new one.

nightwing/CodeMirror,notepadqq/CodeMirror,wingify/CodeMirror,thomasjm/CodeMirror,mtaran-google/CodeMirror,hackmdio/CodeMirror,wingify/CodeMirror,pabloferz/CodeMirror,codio/CodeMirror,nightwing/CodeMirror,namin/CodeMirror,SidPresse/CodeMirror,pabloferz/CodeMirror,notepadqq/CodeMirror,mtaran-google/CodeMirror,hackmdio/CodeMirror,namin/CodeMirror,notepadqq/CodeMirror,codio/CodeMirror,dperetti/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror,SidPresse/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,pabloferz/CodeMirror,codio/CodeMirror,thomasjm/CodeMirror,namin/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,dperetti/CodeMirror,dperetti/CodeMirror