there is no UI for editing variables in the debugger. It would be great if one could directly edit either the expression or its value (by just left-clicking on it, it would get selected and highlighted, pressing any key would delete it and enter this key). I think if that option were implemented the debugger would become much much more functional. It was implemented in Kdevelop 3 (>3.3 I guess) (https://bugs.kde.org/show_bug.cgi?id=72183)
*** Bug 257343 has been marked as a duplicate of this bug. ***
Initial reviews: https://git.reviewboard.kde.org/r/107157 https://git.reviewboard.kde.org/r/107158/ They're stalled right now, any takers welcome.
*** Bug 377291 has been marked as a duplicate of this bug. ***