electron: fix re-opening of electron window

[vince-fugnitto]

What it does

Fixes: #9990.

The commit restores the previous window state (position and size) when re-opening an electron window, and also preserves the fix that avoids the electron window overlap. The idea is to use the previous windowstate when opening the window when a single window is found.

How to test

1. start the example-electron application.
2. resize the window, and move the window position.
3. close the window, and re-open it - the size and position should be restored.
4. open a new window (or folder) - there should be a proper overlap (not exactly on top of the other window(s)).

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

Signed-off-by: vince-fugnitto [email protected]

[vince-fugnitto]

Still investigating if there is a cleaner more generic fix.

[ccorn]

A git cherry-pick origin/vf/electron-fix indeed has solved the issue for me.