Comment 8 for bug 1853617

I changed the testcase.sh a little bit (attachment) ..
the text "upper left" has been moved to up and left etc ..
and row with column number has been added to the string.

After several tests I noticed that:
 - the only text aligned "lower" (left, middle and right) is rendered incorrectly
 - the plain text as well as attributes are shifted
 - the text with exactly size 8 is properly rendered
 - the unwanted offset depends linearly on the size of the text
 - only the coordinate Y is incorrect and always reduced