From 24b6ad903ab2ed620f8c754aafb727e6aa342aca Mon Sep 17 00:00:00 2001
From: Jan Grulich <jgrulich@redhat.com>
Date: Wed, 26 Jul 2023 15:38:13 +0200
Subject: [PATCH 04/15] QGtk3Theme: subscribe to theme hint changes

---
 .../platformthemes/gtk3/qgtk3theme.cpp        | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
index 6e9e89fa..67fdf7d3 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
@@ -40,6 +40,7 @@
 #include "qgtk3theme.h"
 #include "qgtk3dialoghelpers.h"
 #include "qgtk3menu.h"
+#include "qpa/qwindowsysteminterface.h"
 #include <QVariant>
 #include <QGuiApplication>
 
@@ -109,6 +110,25 @@ QGtk3Theme::QGtk3Theme()
 
     /* Use our custom log handler. */
     g_log_set_handler("Gtk", G_LOG_LEVEL_MESSAGE, gtkMessageHandler, nullptr);
+
+#define SETTING_CONNECT(setting) g_signal_connect(settings, "notify::" setting, G_CALLBACK(notifyThemeChanged), nullptr)
+    auto notifyThemeChanged = [] {
+        QWindowSystemInterface::handleThemeChange(nullptr);
+    };
+
+    GtkSettings *settings = gtk_settings_get_default();
+    SETTING_CONNECT("gtk-cursor-blink-time");
+    SETTING_CONNECT("gtk-double-click-distance");
+    SETTING_CONNECT("gtk-double-click-time");
+    SETTING_CONNECT("gtk-long-press-time");
+    SETTING_CONNECT("gtk-entry-password-hint-timeout");
+    SETTING_CONNECT("gtk-dnd-drag-threshold");
+    SETTING_CONNECT("gtk-icon-theme-name");
+    SETTING_CONNECT("gtk-fallback-icon-theme");
+    SETTING_CONNECT("gtk-font-name");
+    SETTING_CONNECT("gtk-application-prefer-dark-theme");
+    SETTING_CONNECT("gtk-theme-name");
+#undef SETTING_CONNECT
 }
 
 static inline QVariant gtkGetLongPressTime()