add a way to change resolution of closed tasks

there seems to be no (obvious) direct way to change the resolution of closed tasks. i would find that very useful to fix "mistried" tasks - tasks that were independently fixed despite being "out of scope" or "need more info", that were found to be duplicates at a later point, whatever - there is a lot of this in the qmake task list. fixing the status retroactively makes sense to improve discoverability of the tasks, and minimizing the noise produced on the way would be certainly welcome.