SUMMARY Currently when closing and reopening the project the state of the linenumbers and the symbol border is not stored. When reopening those border have to be turned on manually again. STEPS TO REPRODUCE 1. Open KDevelop 2. Enable line numbers and symbol border 3. Restart KDevelop OBSERVED RESULT Line numbers and symbol border are still enabled EXPECTED RESULT Line number and symbol border has to be made visible again
The UI you are using is apparently meant to be transitory. Permanent settings can be adjusted in Configure KDevelop => Editor => Appearance => Borders. This is a KTextEditor feature in any case. The same UI is present in Kate. If you still believe the state of the checkboxes should be preserved after restarting, move this bug to the frameworks-ktexteditor Product.
Thank you Igor, sorry I did not see this option. Thanks a lot!