Fix Firefox scanning when some combining characters are present #1214
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Firefox's implementation of
Range.getClientRects()
does not match Chromium when text contains certain unicode combining characters and cannot be relied upon.Fun 12 year old bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=816238
This was previously handled in Yomichan but 5 years ago it was removed in ea9c5ad. Japanese text and Japanese combining characters do not have this issue but some other languages do.
Fixes #1002