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 *mac_thumb_xpm[] = {
/* width height ncolors chars_per_pixel */
"14 15 4 1",
/* colors */
"a c #aaaaaa",
"b c #cccccc",
"c c #333366",
"d c #666666",
/* pixels */
"bbbbbbbbbbbbbc",
"baaaaaaaaaaaac",
"baaaaaaaaaaaac",
"baaabbbbbbaaac",
"baaaddddddaaac",
"baaabbbbbbaaac",
"baaaddddddaaac",
"baaabbbbbbaaac",
"baaaddddddaaac",
"baaabbbbbbaaac",
"baaaddddddaaac",
"baaabbbbbbaaac",
"baaaaaaaaaaaac",
"baaaaaaaaaaaac",
"cccccccccccccc",
};