When double-clicking on a default anonymous <summary> element, the first
eMouseClick will make the summary element being removed from the
document. This generates an assert in
PresShell::HandleEventWithTarget().
To prevent this assert, ensure the mouseContent is in document before
dispatching the eMouseDoubleClick event.
Since GetCrossShadowCurrentDoc() was deprecated, replace it with
GetComposedDoc().
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extra : commitid : K9pCdof8z3f
extra : rebase_source : 3adfdb9938de30fd0ca365168c33dcdcef8ca285
0beafc0ac8