Description of problem:
Since the update to Qt5.6, the plasma panel seems to stay on the leftmost screen.
Plugging an external monitor which becomes the primary screen, or switching the primary screen in kcm_kscreen doesn't move the panel.
Even restarting plasmashell doesn't always work (I had to do it several times until it finally was on he right screen).
Version-Release number of selected component (if applicable):
Switch primary screen using kcm_screen.
The panel doesn't move (with Qt5.5, it moved but often the maximized windows didn't resize and were partially under the panel, so I had to restart plasmashell anyway).
The desktop icons most of the time disappear (I often get a black background without wallpaper, but this issue isn't new).
The desktop icons, and panel are moved to the new primary screen.
On screen unplug, the panel seems to sometimes move out of the screen : we see the wallpaper instead.
Since I upgraded from F22 to F24 (which currently uses Plasma 5.7.5), I also observe that the single panel I am using sometimes (but not always) refuses to automatically move to the current Primary Display when I change
System Settings > Display Configuration > Primary display
to "Dell ..." (my external monitor) or "Laptop Screen".
I'm using a dual-screen setup (LVDS on the left, external monitor on the right), and I usually set Primary Display = external monitor. Due to KDE stability issues (since F22 ...) I typically don't plug or unplug the external monitor while a KDE session is running.
In F22 with Plasma 5.5.5 and Qt5.5, the KDE panel used to always stay on the Primary Display, i.e., it moved automatically when I changed the Primary Display from "Laptop Screen" to external monitor or back.
With Plasma 5.7.5 and Qt5.6.1, the panel can be moved manually to a different display by using Panel Settings and click-selecting/moving 'Screen Edge'. I knew that the panel can be moved to a different screen edge on the same display, but the ability to move it manually to a different display looks new to me.
Actually this may be a new design flaw: Once the user has moved a panel away from the Primary Display using 'Screen Edge', it's not clear what should happen
(1) when the Primary Display is changed: Should the panel be moved to the new Primary Display or remain "pinned" where the user wanted it to be?
(2) during a logout/login cycle: Should the manual change be preserved or ignored in favor of always using the Primary Display on login?
Moreover, what if the user creates a separate panel on each display, by creating a new panel (on the Primary Display) and then moving it to another display?
I'm wondering if any of these issues are addressed by Plasma 5.7.95 (5.8?), see
"This release sees many bugfixes in multi-screen support and, together with Qt 5.6.1, should significantly improve your experience with docking stations and projectors."
(In reply to Fredy Neeser from comment #2)
> Actually this may be a new design flaw: Once the user has moved a panel away
> from the Primary Display using 'Screen Edge', it's not clear what should
> (1) when the Primary Display is changed: Should the panel be moved to the
> new Primary Display or remain "pinned" where the user wanted it to be?
I just tested it:
- Set Primary Display to "Laptop Screen"
- Manually move the panel to the external monitor
- Change Primary Display to external monitor
- What happens: Panel moves to laptop screen! This makes no sense!
- Expected : Panel should stay on external monitor
> (2) during a logout/login cycle: Should the manual change be preserved or
> ignored in favor of always using the Primary Display on login?
I can confirm that a manual change of the panel location is preserved through logout/login.
In summary, I'm not sure that it makes sense at all to allow moving a panel away from the Primary Display.
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