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I often connect screen and disconnect it. Problem is: it can mess up. Desktop content can just disappear and I cannot figure how to fix this. Solution is to add button "display each screen KDE remember" and add way to switch desktop screen content. It also repair other problems like moving desktop content on bad screen.

Lachu wrote:I often connect screen and disconnect it. Problem is: it can mess up. Desktop content can just disappear and I cannot figure how to fix this.

This certainly is annoying. But the fix should not be yet another button or option. The fix should be fixing the actual issue: that things get messed up.
For which you'd have to provide a clear description what happened when, along with debugging information. Sure, not easy, but the only way to actually fix issues.

Lachu wrote:Solution is to add button "display each screen KDE remember" and add way to switch desktop screen content. It also repair other problems like moving desktop content on bad screen.

Why should a new button fix anything? You'd still have to solve the same issue: that things get messed up (if that is the case). Application states are already persistent, screen settings are already persisted. So what issue should a new option to do that solve?

Fix the cause, not the symptom!

Problem is, when I connect additional display, laptop screen's desktop content (plasma window perhaps) was moved on new screen. When I unplug additional screen, content was not moved to previous position.
Possible fix: do not move content of screen to new screen.

But button and possibility to move plasma's window will fix that issue.

Lachu wrote:[...]
But button and possibility to move plasma's window will fix that issue.

Again: no, a "button" will not fix anything. A "button" is not something magic that makes all problems go away.
The issue is that in your view the behavior of plasma when screens are added / removed / switched is broken. If so, then that has to be fixed. Just shouting "we need a button!" does not help anyone.

In my opinion, problem is with connecting desktop to monitor. It is static. Making it configurable will be some good solution. Repairing KWIN/Plasma logic do not help anything, because users will still be faced with the same problem - you disconnects screen? You will lost you settings. Some solution for two monitor workplace is primary screen setting, but we cannot extend this for more screens.

The placement of windows on the screen is already persisted. As is the setup for each specific screen setup the system ever has been in. The combination should offer what you want, but apparently that does not work. Which is why it has to get fixed.

Implementing an _additional_ persistance layer will only double the already implemented logic, hardly a good idea.
My main point however was that a "button" is not solving any problem. You'd have to implement a full fledged persistence layer that _may_ also include a button.

What, when I sell monitor and connect new one?