my_bg.y = tmp_bg.y + tmp_bg.height;
my_cell.y = tmp_cell.y + tmp_cell.height;
470: my_expose.y += tmp_expose.y + tmp_cell.height;
it should be:
my_expose.y = tmp_expose.y + tmp_cell.height;
The code is part of drawing p->minimal. Fortunately it's not a bug.
Because my_expose is not used after that point ( only my_cell ).
I discovered it, when I added several texts to minimal rendering and nothing shown.
I originally thought, it's my fault, but ...

Thanks for your great work. many many thanks