I recently upgraded to Opera v. 55.0.2994.44, and it now displays no window decorations. I assume this could be part of the whole misguided CSD (client-side decorations) thing. I see nothing particularly useful in the output of FvwmIdent (is there a way to send this to a text file?)
I tried putting
Style Opera GNOMEIgnoreHints in my config, and restarted Fvwm, and this made no difference.
Is there a way to force always having a title bar and window borders, per my Fvwm config, no matter what the application says to do?
I’m on Fvwm v. 2.6.5
Update: I’m not certain this is a CSD issue, but for the curious:
How to disable GTK3 Client-Side Decorations.
Interesting thing there, it says:
Uh, so Fvwm has a compositor?