Git扩展的的问题，通过shift+command+p执行SCM: Disable Preview来回退，会发现图标被还原了，然后世界就安静了，参见更新文档里关于该问题的解释：
Some users are reporting issues with the new Git integration and the
keyboard layout support：
The new Git source control extension is now enabled by default. This
Git integration goes through the same extension points as third-party
SCM providers. We're still working on the Git extension and if you'd
like to go back to the previous version, you can run the SCM: Disable
Preview SCM command to switch back.
You can quickly tell if the Git extension is enabled by looking at the
Activity Bar icon. The new SCM provider integration will show a merge
icon instead of the Git icon:
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
