[GTK] Make isWayland real check

And not just !isX11(). There are other backends like broadway, windows,
quartz.

Author: akurtakov

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/os.c

@@ -53,6 +53,18 @@ JNIEXPORT jlong JNICALL GDK_NATIVE(GDK_1EVENT_1WINDOW)
 }
 #endif
 
+#ifndef NO_GDK_1IS_1WAYLAND_1DISPLAY
+JNIEXPORT jboolean JNICALL GDK_NATIVE(GDK_1IS_1WAYLAND_1DISPLAY)
+	(JNIEnv *env, jclass that, jlong arg0)
+{
+	jboolean rc = 0;
+	GDK_NATIVE_ENTER(env, that, GDK_1IS_1WAYLAND_1DISPLAY_FUNC);
+	rc = (jboolean)GDK_IS_WAYLAND_DISPLAY((GdkDisplay *)arg0);
+	GDK_NATIVE_EXIT(env, that, GDK_1IS_1WAYLAND_1DISPLAY_FUNC);
+	return rc;
+}
+#endif
+
 #ifndef NO_GDK_1IS_1X11_1DISPLAY
 JNIEXPORT jboolean JNICALL GDK_NATIVE(GDK_1IS_1X11_1DISPLAY)
 	(JNIEnv *env, jclass that, jlong arg0)

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/os.h

@@ -71,8 +71,10 @@
 #endif
 #if !GTK_CHECK_VERSION(4,0,0)
 #include <gdk/gdkx.h>
+#include <gdk/gdkwayland.h>
 #else
 #include <gdk/x11/gdkx.h>
+#include <gdk/wayland/gdkwayland.h>
 #endif
 #else
 

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/os_stats.h

@@ -26,6 +26,7 @@
 typedef enum {
 	GDK_1EVENT_1TYPE_FUNC,
 	GDK_1EVENT_1WINDOW_FUNC,
+	GDK_1IS_1WAYLAND_1DISPLAY_FUNC,
 	GDK_1IS_1X11_1DISPLAY_FUNC,
 	GDK_1TYPE_1PIXBUF_FUNC,
 	GDK_1TYPE_1RGBA_FUNC,

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/GDK.java

@@ -247,6 +247,8 @@ public class GDK extends OS {
 	/** @param event cast=(GdkEventAny *) */
 	public static final native long GDK_EVENT_WINDOW(long event);
 	/** @param display cast=(GdkDisplay *) */
+	public static final native boolean GDK_IS_WAYLAND_DISPLAY(long display);
+	/** @param display cast=(GdkDisplay *) */
 	public static final native boolean GDK_IS_X11_DISPLAY(long display);
 	/** @method flags=const */
 	public static final native long GDK_TYPE_RGBA();

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java

@@ -706,7 +706,7 @@ public static int VERSION(int major, int minor, int micro) {
 }
 
 public static boolean isWayland () {
-	return !isX11 ();
+	return OS.GDK_WINDOWING_WAYLAND() && GDK.GDK_IS_WAYLAND_DISPLAY(GDK.gdk_display_get_default());
 }
 
 public static boolean isX11 () {