Whenever I plug in my other HDMI monitor and go to the monitor settings in xcfe, I can enable the second monitor. When I do this and apply the settings both monitors are mirrored immediately although it was shown as extended monitor before. The checkbox for mirroring the monitor is unchecked as well. So I have ot check it and uncheck it again to use it as extending monitor. xfce should remember that the monitor was used as extension and when enabling it again it should be used as one and not mirroring. If it mirrors the other monitor, at least the check box should be checked then.
I did not noticed this bug and accidentally opened a new bug https://bugzilla.xfce.org/show_bug.cgi?id=13590
accidentally duplicated this at https://bugzilla.xfce.org/show_bug.cgi?id=13721 (with more details and screenshots)
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