When the data is too long to be displayed in the data grid Heidi tries to display it in tooltip. It works OK for varchar/text.
However, with BLOBs the tooltips are too long (and mostly useless). If I have Heidi on my left monitor, the blob's tooltip displayed as a single line to the end of the left monitor and then it is continues to the end of the right monitor.
It would be nice to have an option to limit the length of tooltips. Alternatively, I think it is OK to display this as multi-line tooltip (EOL after every 16 bytes for example).