After some more testing I came to the conclusion that proportionally
balanced shadows (as proposed by David Black) will result in improved
appearance when using a light theme (and will be OK for dark themes,
too). Also, with that fix in effect, it is sufficient to change the
value of
The solution proposed by David Black won't eliminate all artefacts
related to the thumbnail window previews. To see this, apply the
proposed solution and then just type "wish" in a MATE-Terminal. The
resulting window has a geometry of 200x200, and the corresponding
thumbnail still gives rise to
Public bug reported:
Version 60 of Dash to Dock added "previews" to the supported click-
action values. IMHO, this new value is far more user-friendly than all
the others, for the following reasons:
1. If an application has at least 2 open windows then a single left-
click enables the user to
Dash to Dock v63 (released on Apr 02 2018) added the new click action
“minimize-or-previews”. IMHO, this is by far the most user-friendly
click action of all supported ones. Unfortunately, this didn't become
the default in Ubuntu 18.10. Currently, the file
