Can you please give command line example commands for one complete "cycle"?

Done and published :)

You as author should be able to edit. When you have the topic opened, on the right side there should be a menu box, including Edit and Delete. Is this box present for you, but no Edit there? I can change the topic myself, if Edit is not working.

Please elaborate in more detail where SmartGit's GitHub integration should be improved or what is not working as expected.

I don't have access to a Mac currently, but you have switch your entire OSX to Dark Mode. Have a look at e.g.: http://osxdaily.com/2015/11/26/enable-dark-mode-mac-os-x/

When you switch your operating system to a dark theme, is SmartGit showing up properly in dark? It should.

The OP was more referring to Mercurial, hence we have renamed this topic and created a new one for Git:

http://smartgit.userecho.com/topics/15-git-stash-selected-files/

I've added a new topic for the Log -- please vote for it:

https://smartgit.userecho.com/topics/16-/

So your request is just to add the Stash menu item to the popup menu? Fine. Regarding stashing of a subset of files, there is already another topic:

http://smartgit.userecho.com/topics/5-stash-selected-files/