Support changing the default shell without %ComSpec%

[EDToaster]

Is your feature request related to a problem? Please describe.

This feature request is a workaround related to windows bug (unconfirmed?) when setting ComSpec to powershell

Steps to reproduce the issue (not related to WezTerm):

1. Set ComSpec environment variable to powershell, like C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
2. Create a .bat file with contents pause
3. Try to run the .bat file by double clicking on it, you'll see that roughly 10 powershell instances are spawned every second, causing the system to eventually run out of memory. Delete the bat file to kill all of the powershell instances before this happens

Not sure what causes this behaviour but it is untenable to change ComSpec at this time.

Describe the solution you'd like

Provide a way to specify the default shell without the use of ComSpec, maybe something like WEZTERM_DEFAULT_SHELL as an environment variable.

Everywhere online seems to suggest that you shouldn't alter the value of ComSpec since a lot of programs will assume it points to cmd.

Describe alternatives you've considered

A quick workaround is to call powershell in CMD every time i open wezterm, but that is annoying.

Additional context

This is the only other report related to the same issue I've found

sbt/sbt#6643

[wez]

Please see: https://wezfurlong.org/wezterm/config/launch.html#changing-the-default-program

To change it just as a one-off, you can wezterm --config "default_prog='powershell.exe'" start

[EDToaster]

turns out i need to learn to read 👍 thanks!

[EDToaster]

for anyone reading this in the future -- default_prog is a vec, so the correct syntax is

wezterm --config "default_prog={ 'program', 'args', 'args' }" start

[github-actions]

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