STR: 1 add line (by default it is red 2 right click "Line color..." 3 Press Cancel - the line is black
I could not reproduce this issue with: 1. add two classes 2. Add a dependency between both classes 3. select dependency 4. right click on 'line color' 5. Press cancel -> the line color is not changed. Did you something else ?
No, I didn't. unfortunately I'm not able to build latest umbrello. It requires some qt4 packages, despite it is qt5 :\ Are these instructions relevant? https://umbrello.kde.org/installation.php
You can build umbrello from master branch for Qt5 with cmake -DBUILD_KF5=1 <source dir>