@meven Sorry I've totally forgotten about your suggestions when I was updating the patch...
I have renamed DetailsDlg to ProcessDetailsDialog. But I've got some minor issues with code indentation. I have tried out uncrustify-kf5 (which didn't even work out-of-box. Instead of formatting the files in-place, it produced *.uncrustify files instead. I have uncrustify 0.69, and I worked around the issue by adding --replace to the arguments for uncrystify in uncrustify-kf5). But the script produces way too many changes in some files I changed. One of those files is processes_linux_p.cpp, which uses both spaces and tabs for indentation. So at this moment I've only committed some of the indentation changes.
Any further help with pushing this patch forward would be greatly appreciated.

Patch updated. Any suggestions?

Rebased to master. Removed uses of deprecated class (QRegExp). Tidied the code up a bit.

In D12827#513118, @meven wrote:

I quite like this feature @chrisx
I hope you can still push it forward after all this time.

Any updates on whether this patch could be merged? It has been a long wait. If there are any improvements I can make to the patch I will be more than happy to put more work into it.

Added detailed memory information to the new process details dialog. Like the original implementation, it displays a message if some of the items are not available.

In D12827#275187, @broulik wrote:

The existing "Show detailed memory information" and "Process details". I think they can be merged.

The show detailed memory information is a QtWebKit-powered "plugin" (I would love to get rid of tbh)