Introduce toggleBlockSelection action

[carlos-zamora]

Summary of the Pull Request

This introduced the toggleBlockSelection action to allow users to create a block selection using only the keyboard. This is not bound to any keys by default, however it is added to the command palette.

References

#4993 - Epic
#5804 - Spec

Validation Steps Performed

• Mark mode always starts in line selection mode
• Mouse selections are always in line selection mode by default
• Can toggle block selection for an existing selection (regardless of how it was created)
• The selection is copied properly (aka, no rendering issues)

[carlos-zamora]

Questions for reviewers

• Should "block selection mode" be a mode that persists? Like, if block selection mode is enabled, should all selections be in block selection by default?
  • personally, I vote no. I think line selection should be the default. Curious if I'm missing anything here though.

Things I should think about (and check)

• How does this work with screen readers? Is the newly selected text read?
  • EDIT: works well!

[lhecker]

Should "block selection mode" be a mode that persists?

I don't think so. It's a seldomly used feature isn't 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.

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[ghost]

🎉Windows Terminal Preview v1.15.186 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes
• Store Download