I tested #236 now and found a problem:
For every plugin installation IDEasy now opens a new window (Eclipse GUI that appears and then disappears). This should be prevented and was fixed in devonfw-ide 1+ year ago.
I am not yet sure what makes the difference. Somehow related to this old code:
https://github.com/devonfw/ide/blob/cdf4af5de21489f3fdcbfdab41af858822e0d598/scripts/src/main/resources/scripts/command/eclipse#L394-L396