This test would keep the autostart disabled but override an existing
autostart entry (see https://github.com/Martchus/syncthingtray/issues/221).
With this change it will no longer override an existing entry. Reading and
writing the autostart entry is now mocked and properly checked.
This makes the code simpler and avoids inconsistent spacing. Unfortunately
this function has only been introduced in Qt 6.4 so the old code has to
stay for older Qt versions.
* Remember new size after user resized the window
* Remember new position after user repositioned window and using explicit
coordinates has been configured in the appearance settings
* Do not blindly override existing auto start entry
* Warn if an auto start entry exists but points to a different executable
* Allow removing such an entry explicitly
This is now misleading as it depends on the general web settings. The
presence of this new settings tab alone should make it clear what will
happen instead so the sentence can just be dropped.