External monitors shrink view port

[sophiajt]

If you use servoshell on macOS and go out to an external monitor, the view gets shrunk to the lower left quadrant.

edit: this seems to only happen when using the full version. The minimal (glutin) version seems okay.

[paulrouget]

Different DPI?

[sophiajt]

Yup, looks like it is.

[paulrouget]

Hmm, we need to do something similar to:

servoshell/src/main.rs

Line 134 in 0587cc0

AppEvent::DidChangeScreenParameters => {

Not sure how to detect the display change yet.