Add support for "Automatic" splits

[zadjii-msft]

Summary of the Pull Request

Adds support for auto as a potential value for a splitPane keybinding's split argument. For example:

        { "keys": [ "ctrl+shift+z" ], "command": { "action": "splitPane", "profile": "matrix", "commandline": "cmd.exe", "split":"auto" } },

When set to auto, Panes will decide which direction to split based on the available space within the terminal. If the pane is wider than it is tall, the pane will introduce a new vertical split (and vice-versa).

References

PR Checklist

• Closes Feature request: automatic splits similar to tiling window managers #3960
• I work here
• Tests added/passed
• [n/a] Requires documentation to be updated

Validation Steps Performed

Ran tests, played with it.

[ghost]

Hello @zadjii-msft!

Because this pull request has the AutoMerge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

Do note that I've been instructed to only help merge pull requests of this repository that have been opened for at least 8 hours, a condition that will be fulfilled in about 6 hours 22 minutes. No worries though, I will be back when the time is right! 😉

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[DHowett-MSFT]

@msftbot merge this in 5 minutes

[ghost]

Hello @DHowett-MSFT!

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 Thu, 19 Dec 2019 20:18:21 GMT, which is in 5 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".

[miniksa]

OK.

[ghost]

🎉Windows Terminal Preview v0.8.10091.0 has been released which incorporates this pull request.:tada:

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