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 *ScrollThumb.xp_xpm[] = {
/* width height ncolors chars_per_pixel */
"7 9 9 1",
/* colors */
"a c #C5D6FC",
"b c #C2D5FC",
"c c #EEF4FE",
"d c #BAD1FC",
"e c #C8D6FB",
"f c #8CB0F8",
"g c #BAD3FC",
"h c #C5D5FC",
"i c none",
/* pixels */
"ccccccd",
"effffff",
"ccccccd",
"effffff",
"ccccccg",
"effffff",
"ccccccg",
"effffff",
"eaahbbg",
};