Using xtermjs in VSCode to an application which respects VT220 protection sequences. DECSED sequence erases the complete screen including the protected fields. This is incorrect behaviour and currently means our developers are unable to test within the IDE.

Protected fields are normally protected from DESCSED erasure to support behaviour like clearing input data or updating areas without having to redraw the whole screen (maybe a throwback to 75 baud accousticly coupled modems?!).

Xtermjs InputHandler.ts currentlly says "Protection attributes are not supported".

Issue #2358 was closed on the (false) premise these sequences are unused. Any chance these could be implemented?