Bug description:

 - open grandr

 - switch resolution to 800x600 (from 1024x768 in my test case)

 - press "apply"

 - things will work

 - switch back to 1024x768

 - press apply

 - you'll see 2 black rectangles, one at the right side and one at the bottom

   side of the window

According to Gustavo Boiko, this happens because of problems in the

timing/order the events are sent, so we need a few calls to XSync and

X{G,Ung}rabServer.

But we have 3+ open connections to the X server! That's a problem when we use

XGrabServer. One is from gtk, one is from XOpenDisplay at grandr.c and the

others are from XOpenDisplay at the screen_apply function (and these leak!).

This patch makes everyone use the gdk display.

diff -Nrup grandr-0.1/src/grandr.c patch-display/src/grandr.c

--- grandr-0.1/src/grandr.c	2007-06-19 10:22:41.000000000 -0300

+++ patch-display/src/grandr.c	2010-01-26 11:51:00.943612132 -0200

@@ -304,12 +304,10 @@ screen_apply (struct ScreenInfo *screen_

 	window = screen_info->window;

 	screen = DefaultScreen (dpy);

-	cur_dpy = XOpenDisplay (NULL);

-

-	if (width == DisplayWidth (cur_dpy, screen) &&

-			height == DisplayHeight (cur_dpy, screen) &&

-			mmWidth == DisplayWidthMM (cur_dpy, screen) &&

-			mmHeight == DisplayHeightMM (cur_dpy, screen) ) {

+	if (width == DisplayWidth (dpy, screen) &&

+			height == DisplayHeight (dpy, screen) &&

+			mmWidth == DisplayWidthMM (dpy, screen) &&

+			mmHeight == DisplayHeightMM (dpy, screen) ) {

 		return;

 	} else {

 		XRRSetScreenSize (dpy, window, width, height, mmWidth, mmHeight);

@@ -401,7 +399,8 @@ apply (struct ScreenInfo *screen_info)

 	struct CrtcInfo *crtc_info;

 	GtkWidget *dialog;

-	//XGrabServer (screen_info->dpy);

+	XGrabServer (screen_info->dpy);

+	XSync(screen_info->dpy, False);

 	set_positions (screen_info);

 	if (!set_screen_size (screen_info)) {

@@ -453,9 +452,11 @@ apply (struct ScreenInfo *screen_info)

 		//}

 	}

-	return 1;

-	//XUngrabServer (screen_info->dpy);

+	XSync(screen_info->dpy, False);

+	XUngrabServer (screen_info->dpy);

+	

+	return 1;

 }

 struct ScreenInfo*

diff -Nrup grandr-0.1/src/main.c patch-display/src/main.c

--- grandr-0.1/src/main.c	2007-06-19 10:22:41.000000000 -0300

+++ patch-display/src/main.c	2010-01-26 11:50:33.745608836 -0200

@@ -29,6 +29,7 @@

 #endif

 #include <gtk/gtk.h>

+#include <gdk/gdkx.h>

 #include <stdlib.h>

 #include "interface.h"

@@ -86,7 +87,7 @@ main (int argc, char *argv[])

   root_window = create_main_win ();

   gtk_widget_show (root_window);

-	display = XOpenDisplay(NULL);

+	display = GDK_DISPLAY();

 	check_server_randr_version (display);