Added fix for mozbz#1196777

firefox.spec

@@ -118,7 +118,7 @@ ExcludeArch: s390x
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        74.0
-Release:        4%{?nss_tag}%{?dist}
+Release:        5%{?nss_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
@@ -182,6 +182,7 @@ Patch412:        mozilla-1337988.patch
 Patch415:        Bug-1238661---fix-mozillaSignalTrampoline-to-work-.patch
 Patch417:        bug1375074-save-restore-x28.patch
 Patch422:        mozilla-1580174-webrtc-popup.patch
+Patch423:        mozilla-1620973.patch
 
 # Wayland specific upstream patches
 Patch574:        firefox-pipewire.patch
@@ -381,6 +382,7 @@ This package contains results of tests executed during build.
 # Workaround for kiosk mode
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1594738
 #%patch241 -p1 -b .kiosk-workaround
+%patch423 -p1 -b .1620973
 
 %patch402 -p1 -b .1196777
 %ifarch %{arm}
@@ -956,6 +958,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Thu Mar 12 2020 Martin Stransky <stransky@redhat.com> - 74.0-5
+- Added fix for mozbz#1196777
+
 * Tue Mar 10 2020 Kalev Lember <klember@redhat.com> - 74.0-4
 - Remove unused libIDL build dep
 - Disabled arm due to build failures

mozilla-1620973.patch

@@ -0,0 +1,44 @@
+diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
+--- a/modules/libpref/init/all.js
++++ b/modules/libpref/init/all.js
+@@ -4018,6 +4018,7 @@
+ #endif
+ #ifdef MOZ_WAYLAND
+   pref("widget.wayland_vsync.enabled", false);
++  pref("widget.wayland.use-opaque-region", true);
+ #endif
+ 
+ // All the Geolocation preferences are here.
+diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
+--- a/widget/gtk/nsWindow.cpp
++++ b/widget/gtk/nsWindow.cpp
+@@ -333,6 +333,7 @@
+ static bool gGlobalsInitialized = false;
+ static bool gRaiseWindows = true;
+ static bool gUseWaylandVsync = false;
++static bool gUseWaylandUseOpaqueRegion = true;
+ static GList* gVisibleWaylandPopupWindows = nullptr;
+ 
+ #if GTK_CHECK_VERSION(3, 4, 0)
+@@ -4955,6 +4956,10 @@
+ }
+ 
+ void nsWindow::UpdateTopLevelOpaqueRegionWayland(bool aSubtractCorners) {
++  if (!gUseWaylandUseOpaqueRegion) {
++    return;
++  }
++
+   wl_surface* surface = moz_gtk_widget_get_wl_surface(GTK_WIDGET(mShell));
+   if (!surface) {
+     return;
+@@ -6690,6 +6695,9 @@
+       Preferences::GetBool("mozilla.widget.raise-on-setfocus", true);
+   gUseWaylandVsync =
+       Preferences::GetBool("widget.wayland_vsync.enabled", false);
++  gUseWaylandUseOpaqueRegion =
++      Preferences::GetBool("widget.wayland.use-opaque-region", true);
++
+   return NS_OK;
+ }
+ 
+