Configure a merge tool for GitKraken on Windows10

I downloaded GitKraken for working with Git repositories and it works great for everything I need, but I haven't been able to configure it to use a merge tool like WinMerge or Meld.

When the program sees a conflict it shows up a button which says "Open in merge tool". Since I haven't configured a Merge tool, I head over GitKraken's preferences and checked out the "Merge tool" section. "Git Config Default" option was selected there and I could only choose "None" or "Git Config Default" options.

I installed Meld for using it with GitKraken, and after that I tried to follow these steps to make it usable within GitKraken's interface, but GitKraken's merge tool choice options haven't changed.

After running a few commands from those steps and some others trying to make it work my .gitconfig file looks like this:

[user]
    name = <myname>
    email = <mymail>
[filter "lfs"]
[filter "lfs"]
    clean = git-lfs clean %f
    smudge = git-lfs smudge %f
    required = true
[core]
    autocrlf = true
    excludesfile = C:\\Users\\<myuser>\\Documents\\gitignore_global.txt
[merge]
    tool = meld
[mergetool "meld"]
    path = C:\\Program files (x86)\\Meld\\Meld.exe
[mergetool]
    prompt = false

I'm not really sure what I did and how to make it work... Anyone can help?

GitKraken has finally added support for choosing one of the merge tools listed in your .gitconfig file.