Fix rendering errors after a scale factor change without reopening the current file

[cart]

When a scale occurs, the cursor is rendered at the wrong position in the current file. This can be fixed by reopening the current file however it is visually unpleasant, it shows a prompt to save the current file if there are unsaved changes, and could result in data loss if the user accidentally chooses to discard the unsaved changes. atom-hidpi has the option to reload the current file when the scale factor changes, but it is disabled by default to prevent data loss.

It would be nice to find a fix that does not involve reopening the current file.