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Add support for Double-Height and Double-Width text to Windows Terminal #11595

@german-one

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@german-one

Description of the new feature/enhancement

At least Windows 11 ships with a conhost version which supports DECDHL and DECDWL. I'm used to telling people who are asking for a better VT support something like "Hey, check out the shiny Windows Terminal. It supports quite some escape sequences that the console host does not, and you can even set it as default terminal app." Now I have to add "... unless you're looking for double height/width text where you explicitly have to use the good ol' console." This feels rather odd 😄

Proposed technical implementation details (optional)

Consider adding this feature to Windows Terminal.
However, from what I've read, the current architecture of conpty doesn't seem to be ready yet. So, I suppose a lot of refactoring would be necessary to get to the preconditions 😧

Related: #7865, #8664
cc @j4james

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    Area-RenderingText rendering, emoji, complex glyph & font-fallback issuesArea-VTVirtual Terminal sequence supportHelp WantedWe encourage anyone to jump in on these.Issue-FeatureComplex enough to require an in depth planning process and actual budgeted, scheduled work.Product-TerminalThe new Windows Terminal.Resolution-Fix-CommittedFix is checked in, but it might be 3-4 weeks until a release.

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