From f9d7c6b4157046a06f4ce04726e743d43ab711a2 Mon Sep 17 00:00:00 2001
From: Jan Grulich <jgrulich@redhat.com>
Date: Wed, 26 Jul 2023 15:38:38 +0200
Subject: [PATCH 05/15] Gtk3Theme: set XCURSOR_SIZE and XCURSOR_THEME for
 wayland sessions

GNOME doesn't set these for Wayland session and without those env
variables set users might experience broken cursor with Qt apps
as QWayland reads them to setup QWaylandInputDevice.

There is no cursor protocol available on Wayland yet, see also
https://gitlab.freedesktop.org/wayland/wayland-protocols/-/issues/58

Qt Wayland QPA plugin still tries to load from those two envs.
---
 src/plugins/platformthemes/gtk3/qgtk3theme.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
index 67fdf7d3..c7ac7804 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
@@ -41,6 +41,7 @@
 #include "qgtk3dialoghelpers.h"
 #include "qgtk3menu.h"
 #include "qpa/qwindowsysteminterface.h"
+#include <QGuiApplication>
 #include <QVariant>
 #include <QGuiApplication>
 
@@ -129,6 +130,20 @@ QGtk3Theme::QGtk3Theme()
     SETTING_CONNECT("gtk-application-prefer-dark-theme");
     SETTING_CONNECT("gtk-theme-name");
 #undef SETTING_CONNECT
+
+    /* Set XCURSOR_SIZE and XCURSOR_THEME for Wayland sessions */
+    if (QGuiApplication::platformName().startsWith("wayland")) {
+        if (qEnvironmentVariableIsEmpty("XCURSOR_SIZE")) {
+            const int cursorSize = gtkSetting<gint>("gtk-cursor-theme-size");
+            if (cursorSize > 0)
+                qputenv("XCURSOR_SIZE", QString::number(cursorSize).toUtf8());
+        }
+        if (qEnvironmentVariableIsEmpty("XCURSOR_THEME")) {
+            const QString cursorTheme = gtkSetting("gtk-cursor-theme-name");
+            if (!cursorTheme.isEmpty())
+                qputenv("XCURSOR_THEME", cursorTheme.toUtf8());
+        }
+    }
 }
 
 static inline QVariant gtkGetLongPressTime()