Abnormal behavior when switching tabs and deleting.

[fanyh]

Version: 1.0.214
Platform: Windows x64 10.0.22631
Plugins: none
Frontend: xterm-webgl

When holding down the Alt key to switch between tabs, it may be incorrectly recognized as inputting the tab ID in the window.
In some scenarios, the delete shortcut may cause the delete button to be unclickable; this can be restored after a restart.