For me it would be quite useful to compute histograms for property values and on the suggestion of @dbommes I'm currently trying to add support for this to the property visualizer.
Would that be appreciated? I'm asking now, as otherwise, I'd save some effort by implementing it in a standalone plugin and wouldn't have to restrict myself to C++98 & Qt4 compat.
I'm currently adding a "show histogram" button to the bottom of the toolbox for appropriate properties (for my purposes, double is enough, but int and bool seem very reasonable too), which would then add a Qwt based histogram inline below, possibly with some controls over bin sizes etc. However I'm very open to suggestions here.
@moebius : If you're interested in this feature, is there some way I could use the CI infrastructure for my own dev branch, so I don't have to duplicate it? (I noticed the CI fails on my PRs as it apparently can't access the git refs in my clone?)