New function set_icon_image_from_image

The new function set_icon_image_from_image() sets the icon image using
a image provided as argument.

This function will be used to avoid call wIconUpdate() with the image
argument, doing the code easier and faster.

This patch calls unset_icon_image(), to free the icon image, to avoid
lost memory. After this patch, in winspector.c, the wIconUpdate() call
don't free the memory before update it.

src/icon.c

@@ -564,6 +564,17 @@ static void unset_icon_image(WIcon *icon)
 	}
 }
 
+void set_icon_image_from_image(WIcon *icon, RImage *image)
+{
+	if (!icon)
+		return;
+
+	unset_icon_image(icon);
+
+	icon->file_image = NULL;
+	icon->file_image = image;
+}
+
 void wIconUpdate(WIcon *icon, RImage *image)
 {
 	WWindow *wwin = NULL;

src/icon.h

@@ -73,5 +73,6 @@ char *wIconStore(WIcon *icon);
 char *get_name_for_instance_class(char *wm_instance, char *wm_class);
 
 void wIconSetHighlited(WIcon *icon, Bool flag);
+void set_icon_image_from_image(WIcon *icon, RImage *image);
 
 #endif /* WMICON_H_ */

src/winspector.c

@@ -763,14 +763,27 @@ static void applySettings(WMButton *button, InspectorPanel *panel)
 		 * the icon text box has an icon path */
 		if (!WFLAGP(wwin, always_user_icon)) {
 			/* Change App Icon image, using the icon provided by the client */
-			if (wapp->app_icon)
+			if (wapp->app_icon) {
-				wIconUpdate(wapp->app_icon->icon,
+				RImage *image = get_rimage_icon_from_wm_hints(wapp->app_icon->icon);
-					    get_rimage_icon_from_wm_hints(wapp->app_icon->icon));
+				if (image) {
+					set_icon_image_from_image(wapp->app_icon->icon, image);
+					update_icon_pixmap(wapp->app_icon->icon);
+				} else {
+					wIconUpdate(wapp->app_icon->icon, NULL);
+				}
+			}
 
 			/* Change icon image if the app is minimized,
 			 * using the icon provided by the client */
-			if (wwin->icon)
+			if (wwin->icon) {
-				wIconUpdate(wwin->icon, get_rimage_icon_from_wm_hints(wwin->icon));
+				RImage *image = get_rimage_icon_from_wm_hints(wwin->icon);
+				if (image) {
+					set_icon_image_from_image(wwin->icon, image);
+					update_icon_pixmap(wwin->icon);
+				} else {
+					wIconUpdate(wwin->icon, NULL);
+				}
+			}
 		} else {
 			/* Change App Icon image */
 			if (wapp->app_icon)