Bug 1233073 - Disable fullscreen transition on Linux. r=karlt

MozReview-Commit-ID: 5iP3vjRDlur

--HG--
extra : rebase_source : 8c47ef69ae835eeaf494512e79c5b133dd131bd7

modules/libpref/init/all.js

@@ -4697,8 +4697,13 @@ pref("full-screen-api.unprefix.enabled", true);
 pref("full-screen-api.allow-trusted-requests-only", true);
 pref("full-screen-api.pointer-lock.enabled", true);
 // transition duration of fade-to-black and fade-from-black, unit: ms
+#ifndef MOZ_WIDGET_GTK
 pref("full-screen-api.transition-duration.enter", "200 200");
 pref("full-screen-api.transition-duration.leave", "200 200");
+#else
+pref("full-screen-api.transition-duration.enter", "0 0");
+pref("full-screen-api.transition-duration.leave", "0 0");
+#endif
 // timeout for black screen in fullscreen transition, unit: ms
 pref("full-screen-api.transition.timeout", 1000);
 // time for the warning box stays on the screen before sliding out, unit: ms