Plot looks broken when using screens with different scale factors

[cosmin.p...@gmail.com]

Hello! I'm having an issue with pyqtgraph that I've described here. Can anybody help me find the piece of code that does the drawing of the grid (or the part where the lines are calculated)? I'm willing to fix this, but someone has to guide me through the code a bit.

https://github.com/pyqtgraph/pyqtgraph/issues/756#issuecomment-456490688