Downgrading screen DPI makes lines extra thick

[tomByrer]

My MacBook Pro is Retina, older external monitor is not. Dragging Atom window from laptop to external monitor makes the lines thick. Fonts seem normal.
Workaround; refresh Atom, lines go back to expected thinness.

"Won't fix" is acceptable, since this is an easily workaround. More of an FYI in case someone else finds it.

[abe33]

Hmm, interesting, do you mind telling me if you get different value for devicePixelRatio in the devtools console when you switch from one screen to the other?

[tomByrer]

Yes, as expected (2 for laptop, 1 for external).
The thick lines will happen only for the showing tab; switching tabs fixes it. Also seems to happen only for the right most pane if in dual pane mode.

[abe33]

Not sure what happens since we don't cache the device pixel ratio in the minimap, and we force a full refresh on resize (which should update the device pixel ratio used to render the minimap). I'll need to find the way to reproduce that as I don't have a retina device at the moment.

[abe33]

If you can try v4.20 and tell me if things got better? I added a media query listener that is suppose to catch when the device pixel ratio changes.

[tomByrer]

Let me look when I get back into the office.