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
#define xbm_width 12
#define xbm_height 12
static char xbm_bits[] = {
0x00, 0x00,
0x00, 0x00,
0x00, 0x03,
0xC0, 0x03,
0xF0, 0x03,
0xFC, 0x03,
0xFC, 0x03,
0xF0, 0x03,
0xC0, 0x03,
0x00, 0x03,
0x00, 0x00,
0x00, 0x00,
};