ANSI codes for saving/restoring attributes not supported

[Tommy Lindgren]

According to http://www.termsys.demon.co.uk/vtansi.htm, VT100 terminals should support these two escape sequences:

  Save Cursor & Attrs <ESC>7
    * Save current cursor position.

  Restore Cursor & Attrs <ESC>8
    * Restores cursor position after a Save Cursor.

VTE-based terminals (gnome-terminal, terminator etc) treat them as

  Save Cursor <ESC>[s
    * Save current cursor position.

  Unsave Cursor <ESC>[u
    * Restores cursor position after a Save Cursor.

i.e. attributes are actually never restored. How to reproduce:

  echo -ne "\00337" # save attributes
  echo -ne "\0033[7m" # reverse video
  echo -ne "\00338" # restore attributes (i.e no reverse video anymore)
  echo this text should not be in inversed colors

In gnome-terminal the message is displayed in reverse video. In xterm it is displayed correctly.

Running Jaunty.

ii gnome-terminal 2.26.0-0ubuntu2
ii libvte9 1:0.20.0-0ubuntu2

[Pedro Villavicencio (pedro)]

Confirmed it works fine in xterm but it doesnt' on a vte based one.

[Pedro Villavicencio (pedro)]

Thanks for your bug report. This bug has been reported to the developers of the software. You can track it and make comments here: http://bugzilla.gnome.org/show_bug.cgi?id=590367

[Thomas Dickey (dickey-his)]

For the record, the vtansi.htm page (originally by Robert M. Free - though I don't see his
name on that copy) contains several technical errors - citing it in a bug report
is a nonstarter.

In this instance, it happens to say something which is relevant, but still not
completely true. In particular, CSI s and CSI u are not vt100 sequences,
but xterm happens to recognize them - because it also recognizes several
sequences from ISO 6429 - this one since 1996.

Saving/restoring attributes on the other hand, is a feature described in technical
manuals available at vt100.net - a source with which the vte developers
appear to be unfamiliar.

[Egmont Koblinger (egmont-gmail)]

This was fixed in vte-0.40 (upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=731205)