I ran across this in the settings recently, haven't had to use this, but I think you can do so under Window Management/Window Rules there.  Size and Position has fullscreen capabilities if it can detect your particular window.  This is plasma 5.8.

I don't get this often outside of games luckily enough to pester me, but it usually only happens once.  Old dark days of catalyst binaries, it would break my multi-display desktop in odd ways, but these days not so much of an issue.

-mb

On Wed, Dec 21, 2016 at 10:05 AM, der.hans <PLUGd@lufthans.com> wrote:
Am 20. Dec, 2016 schwätzte Brian Cluff so:

moin moin,

that worked for the site that was annoying me yesterday. I would still
like to have a way to tell KDE to never allow fullscreen when opening a
new window.

"Open new windows in a new tab instead" is checked in Firefox, but this
link gets a new window anyway :(. Having that option work properly would
have also fixed the current annoyance.

ciao,

der.hans

Have you tried playing with some custom window settings for those particular apps?  You should be able to force whatever window settings you want on them and get them to do exactly what you would like automatically in the future.
If you can't find it, I can show you where the settings are at Stammtisch tonight.

Brian Cluff

On 12/20/2016 12:30 PM, der.hans wrote:
moin moin,

I have a couple work apps ( some web, some standalone ) that insist on
opening full screen. Is there a way to disable that in KDE?

The only reason a normal app should go fullscreen is if I intentionally
change it to fullscreen. Autofullscreen is really annoying and
distracting.

I currently don't care about other desktop environments. In fact, moving
to KDE is how I permanently disabled fullscreen in Unity :).

ciao,

der.hans

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