OSC 115 Reset Tektronix Foreground Color

OSC 115 ST puts the color of what is drawn in xterm’s Tektronix 4014 window, OSC 15, back as the terminal started it, undoing any change made with OSC 15 ; Pt ST. xterm resets it to the value it started with (ResetColorsRequest).

It takes no parameter. xterm ignores an OSC 115 that carries anything after the number, OSC 115 ; 1 ST say, as a malformed sequence (do_osc); an empty one, OSC 115 ; ST, is the same as none.

libghostty-vt has no such color, and ignores OSC 15 and OSC 115, so the case that asks is a known difference.

Validation

OSC115-1: After a change

\e]15;red\a
\e]115\a
\e]15;?\a

|____|
reply \e]15;rgb:0000/0000/0000\a