https://bugs.kde.org/show_bug.cgi?id=356225
--- Comment #156 from jamese <james.el...@gmail.com> --- I was able to duplicate the issue of moving/migrating panels yesterday on KDE Neon User / Plasma 5.7.1 packages / Qt 5.7.0 with X Intel driver. I had my laptop plugged into a DisplayPort (1.1) screen @ 2560x1440. It's a Dell U2711. DP1 is left of Laptop Screen. Both had/have panels at the top screen edge, which is my preferred position for panels. When I pulled the cable the panel on the Laptop screen blanked for < 1 second then came back with the panel, I put the plug back in and the DP1 screen came back with the panel on it in the correct position. All Good! I repeated the above again and the panel disappeared from the Laptop screen, plugging DP1 back in the screens flickered then DP1 came back up with the correct backgrounds but the panel from the Laptop screen was overlaid over the DP1 panel. There was no panel left on the Laptop Screen. Unplugging the DP1 screen and the Laptop screen is then left with no panel at all. I right click on the desktop and choose "Add Panel > Default Panel" and I can get the panel back but now have 3 panels when I plug back in DP1. Two on DP1 at the top, one on Laptop at the bottom. I removed one of the duplicate panels on DP1, unplugged DP1 and replugged it after a few seconds and the duplicate panel came back for about 5 seconds then disappeared on it's own. I've now unplugged and replugged the screen about 10 times and cannot reproduce the issue with the moving panels at all. So it seems to be a transient problem that is difficult to reproduce, at least for me. One further thing of interest is that If I drag a Chrome window from DP1 to Laptop then unplug DP1 and replug it in after a few seconds, the Chrome window moves back to DP1 rather than staying on Laptop. I'm no KDE/Qt coder but it seems to me that KDE doesn't record the screen "ID" that a Window/Panel/Widget was on? If I put a Window/Panel on Laptop Screen it should stay on Laptop Screen forever and never be moved by the system. Likewise, in my three screen setup where I have two MST DP screens (Panels placed at top) above with the Laptop Screen centred below them (panel placed at bottom), the panels should always remain on the screens that I placed them on. Why would I want them to be moved if I placed them in a preferred position and why would I want the Chrome window to move back to the screen I just moved it off ? Linking a Window/Panel to a screen would completely avoid the problem of having a panel from a Laptop screen move to a screen that's been unplugged and is no longer active. Maybe that's already done and it's not working, I don't know! If one of the devs has a testing process that would help them nail this bug I'd be really really happy to help out testing updated packages on my multi-screen setups. -- You are receiving this mail because: You are watching all bug changes.
