Didn't find anything obvious in dom/*. In widget/gtk https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#2167 https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#417 https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#423 could have something to do with this. sLastUserInputTime is guint32 after all.
Bug 1698037 Comment 4 Edit History
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Didn't find anything obvious in dom/*. In widget/gtk https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#2167 https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#417 https://searchfox.org/mozilla-central/rev/aa9a7136835deb0eeba00c62bb50a4a0e2cdea2d/widget/gtk/nsWindow.cpp#423 could have something to do with this. sLastUserInputTime is guint32 after all. Perhaps karlt recalls that code. Or maybe that code it totally unrelated to this issue after all.