Enable dark themes by pref in about:config (Bug 1272332)

1 files changed, 71 insertions, 0 deletions

diff --git a/mozilla-1272332.patch b/mozilla-1272332.patch
new file mode 100644
index 0000000..3d7b10e
--- /dev/null
+++ b/mozilla-1272332.patch
@@ -0,0 +1,71 @@
+# HG changeset patch
+# User Nicolas Silva <nsilva@mozilla.com>
+# Parent  14c5bf11d37b9e92d27f7089d9392de2ac339bb3
+Bug 1272332 - Allow gtk the global dark theme behind a pref. r=karlt
+
+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
+@@ -4560,16 +4560,17 @@ pref("gfx.content.use-native-pushlayer",
+ #ifdef ANDROID
+ pref("gfx.apitrace.enabled",false);
+ #endif
+ 
+ #ifdef MOZ_X11
+ pref("gfx.content.use-native-pushlayer", true);
+ #ifdef MOZ_WIDGET_GTK
+ pref("gfx.xrender.enabled",false);
++pref("widget.allow-gtk-dark-theme", false);
+ #endif
+ #endif
+ 
+ #ifdef XP_WIN
+ pref("gfx.content.use-native-pushlayer", true);
+ 
+ // Whether to disable the automatic detection and use of direct2d.
+ pref("gfx.direct2d.disabled", false);
+diff --git a/widget/gtk/nsLookAndFeel.cpp b/widget/gtk/nsLookAndFeel.cpp
+--- a/widget/gtk/nsLookAndFeel.cpp
++++ b/widget/gtk/nsLookAndFeel.cpp
+@@ -1093,26 +1093,32 @@ nsLookAndFeel::Init()
+     GdkRGBA color;
+     GtkStyleContext *style;
+ 
+     // Gtk manages a screen's CSS in the settings object so we
+     // ask Gtk to create it explicitly. Otherwise we may end up
+     // with wrong color theme, see Bug 972382
+     GtkSettings *settings = gtk_settings_get_for_screen(gdk_screen_get_default());
+ 
+-    // Disable dark theme because it interacts poorly with widget styling in
+-    // web content (see bug 1216658).
+-    // To avoid triggering reload of theme settings unnecessarily, only set the
+-    // setting when necessary.
+-    const gchar* dark_setting = "gtk-application-prefer-dark-theme";
+-    gboolean dark;
+-    g_object_get(settings, dark_setting, &dark, nullptr);
+ 
+-    if (dark) {
+-        g_object_set(settings, dark_setting, FALSE, nullptr);
++    bool isContentProcess = XRE_IsContentProcess();
++    bool allowDarkTheme = mozilla::Preferences::GetBool("widget.allow-gtk-dark-theme", false);
++
++    if (isContentProcess || !allowDarkTheme) {
++        // Disable dark theme because it interacts poorly with widget styling in
++        // web content (see bug 1216658).
++        // To avoid triggering reload of theme settings unnecessarily, only set the
++        // setting when necessary.
++        const gchar* dark_setting = "gtk-application-prefer-dark-theme";
++        gboolean dark;
++        g_object_get(settings, dark_setting, &dark, nullptr);
++
++        if (dark) {
++            g_object_set(settings, dark_setting, FALSE, nullptr);
++        }
+     }
+ 
+     GtkWidgetPath *path = gtk_widget_path_new();
+     gtk_widget_path_append_type(path, GTK_TYPE_WINDOW);
+ 
+     mBackgroundStyle = create_context(path);
+     gtk_style_context_add_class(mBackgroundStyle, GTK_STYLE_CLASS_BACKGROUND);
+