Improve menu rendering: separators, bevel edges, cascade arrows, title

- Entry separators: light line on top, dark line on bottom between entries
- Left/right bevel edges on each entry
- Cascade arrow (triangle) for submenu entries
- Paint menu frame title bar (wl_frame_paint) when menu is shown
- Matches X11 menu_draw_frame behavior

src/backend/wayland/wl_backend.c

@@ -6558,6 +6558,35 @@ static void wl_menu_paint_entry(WMenu *menu, int index, int selected)
                      w - 8 - tw, text_y, entry->rtext, strlen(entry->rtext));
     }
 
+    /* Draw cascade arrow for submenus */
+    if (entry->cascade >= 0) {
+        int ay = y + h / 2;
+        for (int i = 0; i < 5; i++)
+            for (int j = -i; j <= i; j++)
+                if (w - 12 + i < w && ay + j >= 0 && ay + j < fb->height)
+                    dst[(ay + j) * stride + (w - 12 + i)] = selected ? 0xFFFFFFFF : 0xFF000000;
+    }
+
+    /* Bevel lines (separators between entries) */
+    uint32_t light = 0xFFDDDDDD;
+    uint32_t dark  = 0xFF555555;
+
+    /* Left edge - light */
+    for (int row = y; row < y + h && row < fb->height; row++)
+        dst[row * stride] = light;
+    /* Right edge - dark */
+    for (int row = y; row < y + h && row < fb->height; row++)
+        if (w - 1 < fb->width)
+            dst[row * stride + (w - 1)] = dark;
+    /* Top line - light (skip first entry) */
+    if (index > 0 && y < fb->height)
+        for (int col = 0; col < w && col < fb->width; col++)
+            dst[y * stride + col] = light;
+    /* Bottom line - dark (skip last entry) */
+    if (index < menu->entry_no - 1 && y + h - 1 < fb->height)
+        for (int col = 0; col < w && col < fb->width; col++)
+            dst[(y + h - 1) * stride + col] = dark;
+
     wlr_scene_buffer_set_buffer(fb->scene_buf, &fb->base);
 }
 

src/menu.c

@@ -983,6 +983,9 @@ void wMenuPaint(WMenu * menu)
 		return;
 	}
 
+	/* paint frame title bar */
+	wm_backend->frame_paint(menu->frame);
+
 	/* paint entries */
 	for (i = 0; i < menu->entry_no; i++) {
 		wMenuPaintEntry(menu, i, i == menu->selected_entry);