Issue #124, case 1: Added test for this case
Actual fix is in stx:libbasic, revision 3563e89f551b.
https://swing.fit.cvut.cz/projects/stx-jv/ticket/124#comment:19
/* XPM */
static char *CheckOnColor_xpm[] = {
/* width height ncolors chars_per_pixel */
"16 16 3 1",
/* colors */
". c none",
"* c black",
"b c red",
/* pixels */
"............bbbb",
"...........bbbbb",
"..........bbbb*.",
".........bbbb*..",
"........bbbb*...",
".......bbbb*....",
".......bbbb*....",
"bb....bbbb*.....",
"bbb...bbbb*.....",
".bbbbbbbb*......",
"..bbbbbbb*......",
"...bbbbbb*......",
"....bbbb*.......",
"....bbb*........",
".....bb*........",
".....bb*........",
};