Terminal: Add support for touchscreen selection

[dianlujitao]

Description of the new feature/enhancement

I'm a Surface pro user and sometimes need to use CLI tools without bothering to pick up the keyboard (although it's a mess to type with on-screen keyboard), but it turns out that Windows Terminal is not optimized for touchscreen at all.

Proposed technical implementation details (optional)

As far as I can tell, the following need to be implemented:

1. Automatically popup on-screen keyboard and resize the window to fit it on touch.
2. Long press to select/copy/paste.
3. Zoom with finger gestures (https://github.com/microsoft/terminal/issues/3149)

[Senko-Dev]

Not Useful For Developers

[DHowett-MSFT]

@diligamer do you speak for all developers?

[Senko-Dev]

@DHowett-MSFT Well, Most Developers Don't Use Touchscreens.

[zadjii-msft]

@diligamer Ah yes, but _some_ developers _do_ use touchscreens, so we shouldn't discount the opinion of a minority of users based solely on the fact that they're a minority.

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Back on topic, I could have sworn that @leonMSFT actually already implemented having the on-screen keyboard appear when you tap on the Terminal. @dianlujitao what verison of the Terminal are you using?

I'm fine with leaving this open to track "Long press to select/copy/paste.", since

• "Automatically popup on-screen keyboard and resize the window to fit it on touch." _should_ already work
• "Zoom with finger gestures" is already being tracked by #3149.

[leonMSFT]

The on-screen keyboard still seems to work as of ver. 0.11.842 on my surface book when i detach my screen FYI!

[j4james]

The on-screen keyboard still seems to work as of ver. 0.11.842 on my surface book when i detach my screen FYI!

Yes! That works for me too. I would have thought just turning on tablet mode might be enough, but this is OK.

However, even with the screen detached, I can't get touch to work for mouse click operations. For example, when using the Linux dialog utility, it doesn't seem to register taps on the dialog buttons.

[dianlujitao]

Yes, can confirm that on-screen keyboard works after turning on tablet mode as @j4james mentioned