The function enableVirtualTerminalProcessing must return an error if
virtual terminal processing (only applicable on Windows) was not
enabled, otherwise we assume that the terminal supports both 256-color
and truecolor.
We have been erroneously assuming that all non-Windows terminals are
256-color and sending escape sequences to those that cannot intepret
them. This led to some parts of Survey prompts being invisible on old
terminals.
Regressed in be4b392530
This ensures that `IOStreams.Out` always keeps the original `Fd()` value even if it's wrapped as a Colorable stream for Windows in cases when enabling virtual terminal processing has failed.
* Re-enable label colors for issue list
* Drop parentheses wrapping issue labels
* Support ANSI escape codes in TablePrinter cells
* Switch to a Truncate implementation that correctly measures ANSI escape codes
* Only output RGB color if terminal has truecolor capabilities
* Enable `ENABLE_VIRTUAL_TERMINAL_PROCESSING` on Windows - fixes wrapping issues with full lines and allows truecolor rendering
Co-authored-by: Mislav Marohnić <mislav@github.com>
