Comment 88 for bug 1308105

I would add the one-line patch, but then every monitor event triggers the "new monitor" signal since all previously known monitors are now forgotten.

To see this bug in action, enable the setting "Configure new displays when connected", then manipulate the monitors with the settings dialog. Move them, turn them on/off, click apply.

You'll quickly find many many display settings popping up.

So while this patch fixes this bug for you, it also creates a new bug for everyone. Please continue to explore and provide additional patches. It's difficult to provide a proper fix when the original issue does not affect me or Simon, the other active maintainer of the display settings..