Escape sequences to set fonts and their attributes are ignored, instead they are displayed as raw

Terminals support escape sequences to alter the fonts. Windows Terminal at the moment only support basic colors and reverse colors

This is linked to #109 #2916 #5461 #5462 #6703 and #6205 as currently most of the VTE52 font attributes are not supported.

Full support can be tested with:
https://github.com/csdvrx/sixel-testsuite/ansi-vte52.sh

Expected output:
https://github.com/csdvrx/sixel-testsuite/blob/master/test-passed-part1.jpg

It would be desirable to support all mintty font attributes, including support for alternative fonts, using ECMA-48 SGR codes. This would be linked to #1163 for usecases like CJK.

Mintty patch implementing this is on mintty/mintty@1250829

This allows sequences like:

echo "\e[12mVery thin font\e[0m"