Instead of re-drawing the pixbuf we just add a style-class "minimized" to the icons that relate to minimized apps and add "opacity: 0.5;".
59baa93a tasklist: Replace exo-lucency with gtkcss
plugins/tasklist/tasklist-widget.c | 96 ++++++++++++++++++++++++++++----------
1 file changed, 71 insertions(+), 25 deletions(-)
Upstream: git.xfce.org