Support for Extended Window Manager Hints

When using xterm.js for Windows SAC sessions, the input line stays fixed in place without adjusting to the size of the terminal (screenshot below). This seems to be because xtermjs doesn’t seem to support a Esc + [18t control sequence, which is emitted by SAC to determine the screen size. Order of events is as follows:

1. SAC emits ESC + [18t (\x1b[18t)
2. The terminal emulator is expected to reply with ESC + [8;RRR;CCCt (\x1b[8;RRR;CCCt)
   • RRR is the number of rows, and CCC is the number of columns
   • This must be sent by the terminal emulator within 3 seconds

Looks like in order for xtermjs to support Windows SAC resizing, there will need to be support added for the ESC + [18t control sequence. Can this be added?

[CraigWiand]

I believe this can be done by executing the resize command and using the -s switch. Based upon my review of the resize code, that should issue a [18t as part of what the docs describe as Sun console escape sequences. This is also described in the Miscellaneous section of the doc.

The idea being, as Alfred describes above:

1. resize -s emits ESC + [18t
2. xtermjs replies with ESC + [8;RRR;CCCt

• RRR is the number of rows, and CCC is the number of columns

The results should be visible via the response from resize and via a stty -a command run before and after.

[jerch]

@asinn826 Opened a PR (#2393) for this. There are several things to fiddle out before we can support it in a clean way. See PR description for more details.