Resets cursor focus with external monitors

When I’m working with an external monitor and leave blink to reference something then come back my cursor is now always on my iPad screen and I must switch it back to the secondary monitor so that I can keep working.

It would be great if Blink remembered where my cursor was last focused to drop this step.

Reproduce the issue in Blink on an iPad connected to an external monitor: leave the app, return, and observe which display receives cursor focus. Trace the existing focus behavior in the relevant iPad and external-display entry points. Done means returning to Blink restores the cursor to the monitor where it was last focused, without disrupting normal iPad use.

Written by the indexing model from the issue text.