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3a8d018880
Remove various calls to SetCapacity() that fall into various misuse categories:
1) Mistakenly believing that the caller should advice the string about zero
terminator.
2) Cases where a single append does the right computation on its own.
3) Calling SetCapacity() with a constant when the string is self-allocated
and could be an nsAuto[C]StringN and the string doesn't get passed on
in a way that could benefit from a heap-allocated buffer.
4) Calling SetCapacity() before assigning a shared buffer to the string.
5) Calling SetCapacity() before calling a function that will either calls
SetLength() anyway or calls Adopt().
MozReview-Commit-ID: IKjfl5gLmcD
Differential Revision: https://phabricator.services.mozilla.com/D4672
--HG--
extra : moz-landing-system : lando