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Author SHA1 Message Date
Makoto Kato
2b953ae3f5 Bug 1361052 - DeleteSelectionAndPrepareToCreateNode should be more safety. r=masayuki 
Bug 768765 isn't enough for fix.  Since Selection::GetAnchorFocusRange can
return nullptr, we should consider this condition.

And I cannot reproduce this using crash test, so I add mochitest for this.

MozReview-Commit-ID: 8Ei5YBIBuWv

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extra : rebase_source : cd11517f73179d949479716a83baec0e1f492eca
 2018-04-13 16:58:06 +09:00