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/

Actually, this is already in our issue tracker (SG-7617 and SG-9945); I've added a new topic here:

https://smartgit.userecho.com/topics/12-/

How will that be different to the File table filter?

You are aware, that Stash does not work on files, but only on the entire repository?