Unable to select text after exiting vim from git

### Windows Terminal version

Unable to reproduce in wt

### Windows build number

10.0.19043.1415

### Other Software

[Git 2.34.1](https://github.com/git-for-windows/git/releases/download/v2.34.1.windows.1/Git-2.34.1-64-bit.exe)
[Vim 8.2.3951](https://github.com/vim/vim-win32-installer/releases/download/v8.2.3951/gvim_8.2.3951_x64.exe) (Note: Issue does not occur using vim bundled with git.)

### Steps to reproduce

1. Run `cmd` or `pwsh`
2. Observe that text can be selected with the mouse.
3. Run `git -c core.editor=C:\\Windows\\vim.bat config --system --edit`
4. Type `:q` to exit vim.
5. Observe that text can not be selected with the mouse.

### Expected Behavior

Text would be selectable, as it was before running git/vim.

### Actual Behavior

Text is not selectable without switching to mark mode.

Reproduce the issue from cmd or pwsh using the external Vim command shown in step 3, then compare it with Vim bundled with Git. Trace how exiting Vim changes mouse selection and mark mode in the terminal; done means text is selectable with the mouse again without switching to mark mode.

Written by the indexing model from the issue text.