why Window Buttons and xfwm4 Alt+Tab cycling show thumnails with image files?

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Laurentius
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why Window Buttons and xfwm4 Alt+Tab cycling show thumnails with image files?

Post by Laurentius » Sun Jan 21, 2018 12:28 am

Although i have unticked "Show windows preview instead of icons when cycling" at Winwow manager tweaks > Compositor, when i open a pdf file (with xreader or evince) o an image with xviewer, ristretto, or Gimp, the window buttons plugin and the Alt+Tab cycler shows a (small) thumbnail, as if it was an icon.
(Other kind of apps show the application icon, as expected. qpdfview shows it's icon, as expected.)

This does not happen at MX-17 with Evince or it's default image viewer (they show the icon)

I'm using Linuxmint 18.3 XFCE now, but i have noticed this behaviour from previous releases, at least 18.1 (i don't remember how 17.x behaved at this subject)

Why does this happen and how could it be fixed so that the compositor setting is honoured by this apps?

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