[Feature request] Add backspace support

[IngvarX]

Hello,

During typing text backspace does nothing instead of removing previous letter. It should delete previous character

Thanks in advance!

[pkrasicki]

Hi, this would be a very useful feature, but difficult to implement correctly. Currently text is drawn on the same layer as everything else, so erasing text would also erase some of the foreground. If you wrote "test" and then erased it, this would be the result:

Something like that would be easy to implement, but I'm not sure it would be useful.