Minimize/Maximize window buttons not displayed in Gnome

Question

I have a TitleAreaDialog

setShellStyle(getShellStyle() | SWT.RESIZE | SWT.MAX | SWT.MIN);

I searched on web and found out that this could be caused by os:

why maximize and minimize option is missing in linux but working in windows

I have run the command

gsettings set org.gnome.desktop.wm.preferences button-layout :minimize,maximize,close

but the result was the same so it is leads me that either the set wasn't succeed or it is other problem.

For some windows the all 3 buttons are displayed but only for some only close is displayed. Can this be caused by an OS setup or it is other problem?

Answer 1

For me (Gnome 3.22) worked:

gsettings set org.gnome.desktop.wm.preferences button-layout 'appmenu:minimize,maximize,close'

together with

gsettings set org.gnome.shell.extensions.classic-overrides button-layout 'appmenu:minimize,maximize,close'

Following elsewhere given answer doesn't work anymore: gsettings set org.gnome.shell.overrides button-layout close,minimize,maximize: