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 *ComboDn_12_xpm[] = {
/* width height ncolors chars_per_pixel */
"12 12 2 1",
/* colors */
"a c black",
"b c none",
/* pixels */
"bbbbbbbbbbbb",
"bbbbbbbbbbbb",
"bbbbaaaabbbb",
"bbbbaaaabbbb",
"bbbbaaaabbbb",
"bbaaaaaaaabb",
"bbbaaaaaabbb",
"bbbbaaaabbbb",
"bbbbbaabbbbb",
"bbbbbbbbbbbb",
"bbaaaaaaaabb",
"bbbbbbbbbbbb",
};