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_win_xpm[] = {
/* width height ncolors chars_per_pixel */
"14 14 2 1",
/* colors */
"a c black",
"b c none",
/* pixels */
"bbbbbbbbbbbbbb",
"bbbbbaaaabbbbb",
"bbbbbaaaabbbbb",
"bbbbbaaaabbbbb",
"bbbbbaaaabbbbb",
"bbbbbaaaabbbbb",
"bbaaaaaaaaaabb",
"bbbaaaaaaaabbb",
"bbbbaaaaaabbbb",
"bbbbbaaaabbbbb",
"bbbbbbaabbbbbb",
"bbbbbbbbbbbbbb",
"bbaaaaaaaaaabb",
"bbbbbbbbbbbbbb",
};