Same as D28507

Disable screen edge modification, but allow the user to open an edge context menu and see the settings.

To set an edge immutable, just add [$i] right after the entry in ElectricBorders group, although the edges settings are shared between some [Effect-something] group under the key BorderActivateSomething.

Since one entry like BorderActivateSomething lists all edges that use this effect, it doesn't make sense to set it immutable.

In kwinrc, set the ElectricBorders and/or Windows group immutable or any entry.

[ElectricBorders]
BottomLeft[$i]=None
Left=None
Right=None
Top[$i]=None

[Windows][$i]
ElectricBorderCornerRatio=0.29
ElectricBorderDelay=300
ElectricBorderMaximize=false
ElectricBorderTiling=true
ElectricBorders=2