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 CheckOn_width 16
#define CheckOn_height 16
static unsigned char CheckOn_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x38,
0x00, 0x3c, 0x06, 0x1e, 0x0e, 0x0f, 0x9c, 0x07, 0xf8, 0x03, 0xf0, 0x01,
0xe0, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00};