Fix spellcheking in beforeInput bug on firefox #24882
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Summary
This resolves #24358, in which the beforeInputEvent wasn't firing when triggering a spellchecking in firefox. The problem was in the getFallbackBeforeInputChars function: the spellchecking event is interpreted as an 'input' event in firefox, which the function wasn't handling.
How did you test this change?
I tested this change in the fixtures/packaging/babel-standalone/dev.html recreating the exact sandbox that creator of the issue built and the beforeInput fires as expected.