Merge pull request #136071 from jtojnar/gnome-qpa

nixos/gnome: enable platform integration for Qt

nixos/doc/manual/from_md/release-notes/rl-2111.section.xml

···
           but instead use more of the YAML-specific syntax.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          GNOME desktop environment now enables
+          <literal>QGnomePlatform</literal> as the Qt platform theme,
+          which should avoid crashes when opening file chooser dialogs
+          in Qt apps by using XDG desktop portal. Additionally, it will
+          make the apps fit better visually.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>

nixos/doc/manual/release-notes/rl-2111.section.md

···
 - Nginx will use the value of `sslTrustedCertificate` if provided for a virtual host, even if `enableACME` is set. This is useful for providers not using the same certificate to sign OCSP responses and server certificates.
 
 - `lib.formats.yaml`'s `generate` will not generate JSON anymore, but instead use more of the YAML-specific syntax.
+
+- GNOME desktop environment now enables `QGnomePlatform` as the Qt platform theme, which should avoid crashes when opening file chooser dialogs in Qt apps by using XDG desktop portal. Additionally, it will make the apps fit better visually.

nixos/modules/services/x11/desktop-managers/gnome.nix

···
       xdg.portal.enable = true;
       xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
 
+      # Harmonize Qt5 application style and also make them use the portal for file chooser dialog.
+      qt5 = {
+        enable = mkDefault true;
+        platformTheme = mkDefault "gnome";
+        style = mkDefault "adwaita";
+      };
+
       networking.networkmanager.enable = mkDefault true;
 
       services.xserver.updateDbusEnvironment = true;

pkgs/development/libraries/qgnomeplatform/default.nix

···
 , lib
 , fetchFromGitHub
 , nix-update-script
+, cmake
 , pkg-config
-, gtk3
+, adwaita-qt
 , glib
+, gtk3
 , qtbase
-, qmake
-, qtx11extras
 , pantheon
 , substituteAll
 , gsettings-desktop-schemas
···
 
 mkDerivation rec {
   pname = "qgnomeplatform";
-  version = "0.6.1";
+  version = "0.8.0";
 
   src = fetchFromGitHub {
     owner = "FedoraQt";
     repo = "QGnomePlatform";
     rev = version;
-    sha256 = "1mwqg2zk0sfjq54vz2jjahbgi5sxw8rb71h6mgg459wp99mhlqi0";
+    sha256 = "C/n8i5j0UWfxhP10c4j89U+LrpPozXnam4fIPYMXZAA=";
   };
 
   patches = [
···
   ];
 
   nativeBuildInputs = [
+    cmake
     pkg-config
-    qmake
   ];
 
   buildInputs = [
+    adwaita-qt
     glib
     gtk3
     qtbase
-    qtx11extras
   ];
 
-  postPatch = ''
-    # Fix plugin dir
-    substituteInPlace decoration/decoration.pro \
-      --replace "\$\$[QT_INSTALL_PLUGINS]" "$out/$qtPluginPrefix"
-    substituteInPlace theme/theme.pro \
-      --replace "\$\$[QT_INSTALL_PLUGINS]" "$out/$qtPluginPrefix"
-  '';
+  cmakeFlags = [
+    "-DGLIB_SCHEMAS_DIR=${glib.getSchemaPath gsettings-desktop-schemas}"
+    "-DQT_PLUGINS_DIR=${placeholder "out"}/${qtbase.qtPluginPrefix}"
+  ];
 
   passthru = {
     updateScript = nix-update-script {

pkgs/development/libraries/qgnomeplatform/hardcode-gsettings.patch

···
-diff --git a/common/gnomehintssettings.cpp b/common/gnomehintssettings.cpp
-index 9860e57..40fa6ec 100644
---- a/common/gnomehintssettings.cpp
-+++ b/common/gnomehintssettings.cpp
-@@ -80,9 +80,17 @@ void gtkMessageHandler(const gchar *log_domain,
- GnomeHintsSettings::GnomeHintsSettings()
-     : QObject(0)
+diff --git a/src/common/gnomesettings.cpp b/src/common/gnomesettings.cpp
+index 717cc9b..ee255ea 100644
+--- a/src/common/gnomesettings.cpp
++++ b/src/common/gnomesettings.cpp
+@@ -150,10 +150,18 @@ GnomeSettingsPrivate::GnomeSettingsPrivate(QObject *parent)
+     : GnomeSettings(parent)
      , m_usePortal(checkUsePortalSupport())
+     , m_canUseFileChooserPortal(!m_usePortal)
 -    , m_gnomeDesktopSettings(g_settings_new("org.gnome.desktop.wm.preferences"))
 -    , m_settings(g_settings_new("org.gnome.desktop.interface"))
+     , m_fallbackFont(new QFont(QLatin1String("Sans"), 10))
  {
 +    g_autoptr(GSettingsSchemaSource) schemaSource = nullptr;
 +    g_autoptr(GSettingsSchema) gnomeDesktopSchema = nullptr;

pkgs/top-level/all-packages.nix

···
 
   qrupdate = callPackage ../development/libraries/qrupdate { };
 
-  qgnomeplatform =  libsForQt514.callPackage ../development/libraries/qgnomeplatform { };
+  qgnomeplatform = libsForQt5.callPackage ../development/libraries/qgnomeplatform { };
 
   randomx = callPackage ../development/libraries/randomx { };