(svn r20697) -Fix [FS#4084]: call the new function after resizing a window so it's not possible a window becomes unmoveable

src/window.cpp

@@ -1549,7 +1549,7 @@ static void EnsureVisibleCaption(Window *w, int nx, int ny)
 	/* Search for the title bar rectangle. */
 	Rect caption_rect;
 	const NWidgetBase *caption = w->nested_root->GetWidgetOfType(WWT_CAPTION);
-	assert(caption != NULL);
+	if (caption != NULL) {
 		caption_rect.left   = caption->pos_x;
 		caption_rect.right  = caption->pos_x + caption->current_x;
 		caption_rect.top    = caption->pos_y;
@@ -1567,6 +1567,7 @@ static void EnsureVisibleCaption(Window *w, int nx, int ny)
 			w->viewport->left += nx - w->left;
 			w->viewport->top  += ny - w->top;
 		}
+	}
 	w->left = nx;
 	w->top  = ny;
 }
@@ -1595,6 +1596,8 @@ void ResizeWindow(Window *w, int delta_x, int delta_y)
 		w->height = w->nested_root->current_y;
 	}
 
+	EnsureVisibleCaption(w, w->left, w->top);
+
 	/* Always call OnResize to make sure everything is initialised correctly if it needs to be. */
 	w->OnResize();
 	w->SetDirty();