Grid-based navigation incompatible with Stage Manager

[caseysprague]

Howdy! Wanted to point out that there is an issue with the grid-based navigation when MacOS Stage Manager is enabled. The grid is offset by the Stage Manager gutter (the left side of the screen where Stage Manager window groups are collected.) In addition to the gutter not being navigable with the grid, attempting to navigate to a grid ID will misplace the cursor by the same width of the gutter. For example, in the screenshot below, navigating to azw would put the cursor ~213px to the left of azw.

[mjrusso]

Thanks for reporting this; I've been meaning to try Stage Manager but haven't gotten around to it yet.

The behaviour (especially the "misplace the cursor by the same width of the gutter" part) seems very similar to #29 — there was the same problem when the Dock was placed on the left and not auto-hidden. Reviewing the fix for #29 though, I'm not sure... I hope there are new APIs to detect Stage Manager. (I did a quick search but I don't see anything; maybe safeAreaInsets, although that doesn't seem quite right.