With the option disabled, task items use the window icon whenever
possible. With the option enabled, the launcher icon is used
instead. This prevents a jarring icon change when applications use
a different icon theme from Plasma Desktop, at the cost of losing
realtime window icon updates being reflected in the Task Manager.
Defaults to on. The Task Manager applets are getting a checkbox
for it.
This is a rock-and-a-hard-place decision. Users are regularly
upset about what they perceive as their theming choice not being
respected, and pleading for app fixes appears to be fairly fruit-
less. It also looks like Wayland will nix runtime window icon
changes. Nonetheless this will likely produce complaints about
edge cases (e.g. Gimp miniature window previews).
CCMAIL:348050
Eike Hein