Fix window manager bug

Window are was not being cleared properly when something was made invisible

src/gwin/gwm.c

@@ -88,18 +88,16 @@ static void WM_Delete(GHandle gh) {
 }
 
 static void WM_Visible(GHandle gh) {
+	#if GDISP_NEED_CLIP
+		gdispSetClip(gh->x, gh->y, gh->width, gh->height);
+	#endif
 	if ((gh->flags & GWIN_FLG_VISIBLE)) {
-		if (gh->vmt->Redraw) {
+		if (gh->vmt->Redraw)
-			#if GDISP_NEED_CLIP
-				gdispSetClip(gh->x, gh->y, gh->width, gh->height);
-			#endif
 			gh->vmt->Redraw(gh);
-		} else
+		else
-			gwinClear(gh);
+			gdispFillArea(gh->x, gh->y, gh->width, gh->height, gh->bgcolor);
-		// A real window manager would also redraw the borders
+		// A real window manager would also redraw the borders here
-	}
+	} else
-
-	else
 		gdispFillArea(gh->x, gh->y, gh->width, gh->height, gwinGetDefaultBgColor());
 }