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 *ScrollDn_disabled.w95.12_xpm[] = {
/* width height ncolors chars_per_pixel */
"12 12 3 1",
/* colors */
"a c white",
"b c #808080",
"c c none",
/* pixels */
"cccccccccccc",
"cccccccccccc",
"cccccccccccc",
"cccccccccccc",
"cbbbbbbbbbcc",
"ccbbbbbbbaac",
"cccbbbbbaacc",
"ccccbbbaaccc",
"cccccbaacccc",
"ccccccaccccc",
"cccccccccccc",
"cccccccccccc",
};