Changes to use env

The generic only works in Ts 4.2+

Also adds a setting to enable/disable the focus lock indicator

workginCopyFileService: only one event for multiple operations

Ref #113911.

* fix: The git commit message field is cropped with negative zoom

* feat: Change margin to padding to prevent overflow truncation

(includes from 4.9.0)
Diff: https://github.com/xtermjs/xterm.js/compare/3504e2e...master

Fixes #108400
Fixes #111562

See #113905

//cc @sandy081 @sbatten

This reverts commit 63a0638d.