Feedback on tweaks and features

[stdout-se]

Hey,

I made some changes for my own purposes at work, and wanted to check if you're interested that I continue working on them to perhaps upstream them? Looking for feedback about improvements, and which ones you're interested in (if any) 😄

I've made a few branches that are based one ontop of the other for now, so this branch shows all the commits in one.
https://github.com/stdout-se/gitfourchette/commits/wip/diff-hotkey

Let me know your thoughts. Best regards!

Patch A: Feature: Add support for Commit Signoff

• Adds a checkbox to the commit form that runs git commit --signoff on the commit. This is a requirement for some places to allow pushing to origin etc. This checkbox has to be ticked every time you want to signoff a commit, it's never checked by default.
• Also adds an option in the settings to enable/disable the feature (disabled by default)
• Read more in the git documentation
• 

Patch B: Feature: Find commits that contain changes to a path

• Adds a new search bar that allows users to search for paths, e.g. "*/application.py". All commits that contain changes to that path are highlighted in the commit tree.
• Also allows filtering, so only matching commits are shown in the tree.
• There are some WIP notes in the commit message.
• 
• 

Patch C: Fix unit tests for Cinnamon desktop

• Unit tests were broken for various reasons. Linux desktop environments tend to report custom XDG_CURRENT_DESKTOP. In my case (Linux Mint) it runs Cinnamon, which reports "X-Cinnamon", but there are many others. Took a stab at finding a more generic one.
• Not sure this is interesting to upstream because tests may not have to work on all possible systems. I just fixed what didn't work on my machine.

Patch D: Add support for freedesktop terminal "Terminator"

• It does what it says in the title 😄

Patch E: Add hotkey F4 to open external difftool

• I find myself opening the external difftool quite a lot, so I prefer to have a hotkey for it.
• If a file is selected in any of the file lists, or if the diff for a file is selected, pressing F4 opens the configured external difftool.