Having to click twice on buttons in the GUI [MacOSX and tk matplotlib backend]

Hi,

Often when I click on buttons in the figure GUI (like zoom, home, settings...), there's no response, and I need to click on the buttons twice or more to get them to work. It would be great if I could only click on them once and get the desired response!

Best,
Max

首先，在 macOS 上使用 tk matplotlib backend 重现 figure GUI 中的双击行为，重点关注 zoom、home 和 settings 等按钮。跟踪 GUI 事件处理，以确定第一次点击在哪个位置丢失；当每个按钮都能对单次点击作出响应时，即表示完成。

由索引模型根据 Issue 内容生成。