Respect the "/max" parameter when starting console apps with defterm enabled

[PankajBhojwani]

Summary of the Pull Request

• Pipe the ShowWindow value through to ConptyConnection
• When TerminalPage receives the new connection, it checks the ShowWindow value and maximizes IF there were no other pre-existing tabs (in glomming mode, we don't want to maximize sessions that did not ask for it)

References

#12154

PR Checklist

• Closes #xxx
• CLA signed. If not, go over here and sign the CLA
• Tests added/passed
• Documentation updated. If checked, please file a pull request on our docs repo and link it here: #xxx
• Schema updated.
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Detailed Description of the Pull Request / Additional comments

This is just a temporary solution until we change our defterm handoff process. Because of the way the process currently works, we have no way of knowing that the connection has requested the window to be maximized until after we have already started a terminal session. This means that we have to manually maximize the window upon receiving the connection, instead of having the session start maximized, as it probably should.

Validation Steps Performed

start /max python with defterm enabled opens up python in a maximized WT window

[zadjii-msft]

This seems like how I'd do it

[carlos-zamora]

@msftbot merge this in 10 minutes

[ghost]

Hello @carlos-zamora!

Because you've given me some instructions on how to help merge this pull request, I'll be modifying my merge approach. Here's how I understand your requirements for merging this pull request:

• I won't merge this pull request until after the UTC date Wed, 26 Oct 2022 18:03:44 GMT, which is in 10 minutes

If this doesn't seem right to you, you can tell me to cancel these instructions and use the auto-merge policy that has been configured for this repository. Try telling me "forget everything I just told you".

[ghost]

🎉Windows Terminal Preview v1.16.3463.0 and v1.16.3464.0 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes
• Store Download

[zadjii-msft]

Note to future me: We don't need to do the same with /min, because defterm very explicitly rejects handoff for minimized console apps. This is probably for the best! I put an attempt in 66f8b25 before I forgot that it was filtered long before the Terminal. NOT doing this for /min saves us all sorts of "what happens if start /min cmd tries to glom?" or "what if someone does start /min cmd && start /max cmd and they glom together?".