When the search query changes, regardless of the search command, always re-calculate matches (bug 1030622) #10223
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Fixes https://bugzilla.mozilla.org/show_bug.cgi?id=1030622
Edit: When following the STR in https://bugzilla.mozilla.org/show_bug.cgi?id=1030622#c4, the problem occurs at step 6 since the automatic population of the findInput apparently doesn't trigger a find event.
Obviously this could, and maybe even should, be seen as a bug in Firefox itself, however it's easy enough to fix in PDF.js and the patch makes sense in general since
PDFFindController.executeCommand
becomes less sensitive to user error when called (e.g. in a custom viewer implementation).