Adds fix for input event duplicates on Firefox on Android
Adds fix for input event duplicates on Firefox on Android

Firefox on Android emits events for sof edits. Since the main aim is to
be able to transliterate in-place this is something we have to live
with. The events for Sayura's own edits are discarded with a hacky
dedupe function.

chanux/sayura.js,chanux/sayura.js