Allow wayland backend again when GTK >= 3.22.27

Undo commit 5fa1132dac5d988130ce1f27c0b2edf69ed0ae1c because now,
under GTK 3.22.37, clibpoard owner-change signal seems to correctly
change the clipboard owner (see GTK fixed bug 790031).
Enabling Wayland will also fix keyboard grabbing of Windows/Super
key which cannot be grabbed under XWayland (issue #1395).

3 files changed, 34 insertions, 1 deletions

diff --git a/src/remmina.c b/src/remmina.c
index 0dc69df3e..eac14d790 100644
--- a/src/remmina.c
+++ b/src/remmina.c
@@ -267,7 +267,12 @@ int main(int argc, char* argv[])
 	const gchar *app_id;
 	int status;
 
-	gdk_set_allowed_backends("x11,broadway,quartz,mir");
+	/* Enable wayland backend only after GTK 3.22.27 or the clipboard
+	 * will not work. See GTK bug 790031 */
+	if (remmina_gtk_check_version(3,22,27))
+		gdk_set_allowed_backends("wayland,x11,broadway,quartz,mir");
+	else
+		gdk_set_allowed_backends("x11,broadway,quartz,mir");
 
 	remmina_masterthread_exec_save_main_thread_id();
 
diff --git a/src/remmina_public.c b/src/remmina_public.c
index a26da37c7..d553a0951 100644
--- a/src/remmina_public.c
+++ b/src/remmina_public.c
@@ -700,3 +700,30 @@ int remmina_public_split_resolution_string(const char *resolution_string, int *w
 	*h = lh;
 	return 1;
 }
+
+/* Return TRUE if current gtk version library in use is greater or equal than
+ * the requered major.minor.micro */
+gboolean remmina_gtk_check_version(guint major, guint minor, guint micro)
+{
+	guint rtmajor, rtminor, rtmicro;
+	rtmajor = gtk_get_major_version();
+	if (rtmajor > major) {
+		return TRUE;
+	}else if (rtmajor == major) {
+		rtminor = gtk_get_minor_version();
+		if (rtminor > minor) {
+			return TRUE;
+		}else if (rtminor == minor) {
+			rtmicro = gtk_get_micro_version();
+			if (rtmicro >= micro) {
+				return TRUE;
+			}else {
+				return FALSE;
+			}
+		}else {
+			return FALSE;
+		}
+	}else {
+		return FALSE;
+	}
+}
diff --git a/src/remmina_public.h b/src/remmina_public.h
index ecbf96718..3031e29c4 100644
--- a/src/remmina_public.h
+++ b/src/remmina_public.h
@@ -116,3 +116,4 @@ gchar* remmina_public_str_replace(const gchar *string, const gchar *search, cons
  * and overwrites the original string */
 gchar* remmina_public_str_replace_in_place(gchar *string, const gchar *search, const gchar *replacement);
 int remmina_public_split_resolution_string(const char *resolution_string, int *w, int *h);
+gboolean remmina_gtk_check_version(guint major, guint minor, guint micro);