System Settings -> Window Managment -> Window Rules
Click on New
Set the Description to something like "No Full Screen" and leave everything else alone, it they should all be set to Unimportant.
Click on the "Size & Position" tab
Check the box next to "Fullscreen" then change the select box next to it to "Force"  and the bubble next to that should be set to "No"
Click OK and it will warn you with the verbage that means that it's going to match ALL windows which would normally not be good, but that's what you want.
Then click Apply on the main System Setting windows and enjoy your no full screen system.

To create an exception to your blanket rules:
Right click on title bar of the application you want to make an exception for and go to "More Actions" -> "Configure Special Application Settings..."
Then select the "Size & Position" and put a check next to "Fullscreen" and set the select box to "Do Not Effect"
Click OK and enjoy your Fullscreen exception!

Brian Cluff

PS, if you're running the latest version of KDE the interface is a little different.  In that case instead of clicking on the "Size & Position" tab you just have to click on Add Property at the bottom and look/search for "Fullscreen" and set all the same options as above.

On 6/10/21 12:07 AM, der.hans via PLUG-discuss wrote:
Am 08. Jun, 2021 schwätzte Matt Graham via PLUG-discuss so:

On 2021-06-08 13:34, der.hans via PLUG-discuss wrote:
is there an easyish way to totally disable apps from going full screen in
KDE?

I do want to be able to ocassionally re-enable full screen for an app, but
am fine if I first have to acknowledge that it's a horrible idea and I
deserve the repercussions :)

Why?  This seems like a strange thing to want.

Because I have a visceral negative reaction when apps unwantedly go full
screen. Aside from messing with my workflow it really, really annoys me.

I don't think you can do this easily.  I tried going into System Settings -> Window Management -> Window Rules and setting the maximum size of a gwenview window to 1024x768.  This made it so that the gwenview windows all snapped to that size, and it was not possible to make them larger using normal window manager operations.  However, the "Full Screen" button still made a gwenview window take over the whole screen.

This is probably controlled by the KToggleFullScreenAction code, which gets kind of low-level in that it calls QT functions you're not supposed to call directly from KDE.  Fiddling with this part of KWidgetsAddons without recompiling everything is probably a non-starter.

Yeah, probably difficult, but it shouldn't be. I will keep searching for
my own version of nerdvana.

ciao,

der.hans 

---------------------------------------------------
PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org
To subscribe, unsubscribe, or to change your mail settings:
https://lists.phxlinux.org/mailman/listinfo/plug-discuss