Spurious diagonal line in Galaxies

Richard Latham writes:

There seems to be a glitch in graphics for Galaxies that sometimes causes an extended line - see in the screenshot below. It's rare but has happened before. I am not sure what triggers it. [...] I am using an ASUS Chromebook with ChromeOS 83.0

galaxies-extra-line

SAVEFILE:41:Simon Tatham's Portable Puzzle Collection
VERSION :1:1
GAME    :8:Galaxies
PARAMS  :5:9x7du
CPARAMS :5:9x7du
SEED    :15:366604293366507
DESC    :18:hzgcdczzdudcczzbfy
NSTATES :2:51
STATEPOS:2:50
MOVE    :6:E17,10
MOVE    :6:E16,11
MOVE    :6:E17,12
MOVE    :6:E15,12
MOVE    :6:E13,12
MOVE    :6:E11,12
MOVE    :6:E10,13
MOVE    :4:E8,3
MOVE    :4:E9,2
MOVE    :4:E7,2
MOVE    :5:E10,3
MOVE    :4:E9,4
MOVE    :4:E5,4
MOVE    :4:E5,2
MOVE    :4:E5,2
MOVE    :4:E4,3
MOVE    :5:E14,7
MOVE    :5:E14,9
MOVE    :5:E15,6
MOVE    :5:E14,3
MOVE    :5:E12,3
MOVE    :10:A17,1,16,3
MOVE    :5:E14,5
MOVE    :5:E17,6
MOVE    :5:E17,6
MOVE    :10:A17,7,16,8
MOVE    :10:A17,3,16,3
MOVE    :10:A15,7,16,8
MOVE    :10:A13,7,13,8
MOVE    :5:E12,7
MOVE    :5:E12,9
MOVE    :4:E8,9
MOVE    :4:E8,7
MOVE    :4:E4,7
MOVE    :4:E4,9
MOVE    :5:E5,10
MOVE    :5:E7,10
MOVE    :4:E5,6
MOVE    :4:E7,6
MOVE    :9:A9,7,10,8
MOVE    :10:A11,7,10,8
MOVE    :8:A5,3,6,3
MOVE    :8:A7,1,8,1
MOVE    :8:A3,7,2,7
MOVE    :10:A7,13,6,12
MOVE    :10:A7,11,6,12
MOVE    :8:A3,3,2,7
MOVE    :8:A1,9,2,7
MOVE    :4:E4,5
MOVE    :10:A11,7,10,8

chrisboyle / sgtpuzzles

Spurious diagonal line in Galaxies #480