Make task switcher with image preview bigger

[huyhoang8398]

I would suggest to make the task switcher a little bigger for easier to use.

• Bellow is the current greybird-dark task switcher, it is really small in big screen
  

• Bellow is Adwaita theme task switcher verry big and easier to use
  

[Mel34]

Workaround is to put this snippet in gtk.css
~ ▶ cat .config/gtk-3.0/gtk.css
/* Xfwm4's alt-tab dialog, aka "tabwin" */
#xfwm-tabwin { -XfwmTabwinWidget-preview-size: 256px; }
Would be nice if it were bigger by default.

[ochosi]

Yeah, I guess bumping the size makes sense. I've doubled it from 64 to 128, hope that strikes a good middle ground for everyone.