clients: If available, prefer top level surfaces for move or rotate

This stops us from rotating or moving pop-up menus by instead rotating
their parents.

This is easiest to see using a multi-seat configuration.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/desktop-shell/shell.c b/desktop-shell/shell.c
index ecc42c5..3c6a3da 100644
--- a/desktop-shell/shell.c
+++ b/desktop-shell/shell.c
@@ -481,6 +481,25 @@
 	}
 }
 
+static struct shell_surface *
+find_toplevel_surface(struct shell_surface *in_surface)
+{
+	struct shell_surface *surface = in_surface;
+
+	if (!surface)
+		return NULL;
+
+	while (surface->parent)
+		surface = get_shell_surface(surface->parent);
+
+	/* If no top level surface was found, just use whatever surface was
+	   originally provided. */
+	if (!surface || surface->type != SHELL_SURFACE_TOPLEVEL)
+		surface = in_surface;
+
+	return surface;
+}
+
 static void
 send_configure_for_surface(struct shell_surface *shsurf)
 {
@@ -1770,6 +1789,8 @@
 	if (!shsurf)
 		return -1;
 
+	shsurf = find_toplevel_surface(shsurf);
+
 	if (shsurf->grabbed ||
 	    shsurf->state.fullscreen || shsurf->state.maximized)
 		return 0;
@@ -4994,6 +5015,8 @@
 	float dx, dy;
 	float r;
 
+	surface = find_toplevel_surface(surface);
+
 	rotate = malloc(sizeof *rotate);
 	if (!rotate)
 		return;