Bug 1892600 Comment 5 Edit History
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Or, we do wrong things here. https://searchfox.org/mozilla-central/rev/38377227b8f96fda8f418db614e6a8aa67d01c31/widget/windows/TSFTextStore.cpp#6589-6607 ([Chromium does similar things](https://source.chromium.org/chromium/chromium/src/+/main:ui/base/ime/win/tsf_text_store.cc;l=1177;drc=c5ea1859abfe643b42f52650bbbb532b33e00ac7), so I think that we do enough things.)