fb603791ab
This overload removes the need for an extra copy when concatenating multiple `nsTSubstring`s together to pass to a fallible `Replace` function. This slightly reduces the quality of the allocation failure error reporting, as the infallible variant may report the wrong size if the failed allocation is the tuple-flattening allocation in the case where the tuple is dependent on the mutating string buffer. I expect this is an uncommon situation, and felt that the extra code complexity from duplicating the codepaths was not worth the OOM failure size accuracy. Differential Revision: https://phabricator.services.mozilla.com/D236273
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<h1><span class="LXRSHORTDESC">managing sequences of characters</span></h1>
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