Based on the initial report the regression range would be: [link](https://hg.mozilla.org/mozilla-central/pushloghtml?startdate=2019-04-01&enddate=2019-04-02). As far as trying to get something more accurate, noticed some differences up that might be relevant or not, Left ALT - open/closes menu; Right ALT - toggles the input. Other than that, oddly enough the compositor seemed to work even on recent nightly build(s); this being the case for Win10 (18362.719) in case the issue would be linked to the Windows OS version in any way.
Bug 1629250 Comment 6 Edit History
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Based on the initial report, the best regression range would be: [link](https://hg.mozilla.org/mozilla-central/pushloghtml?startdate=2019-04-01&enddate=2019-04-02). As far as trying to get something more accurate, noticed some differences up that might be relevant or not, Left ALT - open/closes menu; Right ALT - toggles the input. Other than that, oddly enough the compositor seemed to work even on recent nightly build(s); this being the case for Win10 (18362.719) in case the issue would be linked to the Windows OS version in any way.