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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;
}
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