That's interesting. I never use SourceTree to invoke a merge but use ctrl-D to open the external diff tool a lot, in my case that's either WinMerge or Beyond Compare. I also notice WinMerge shows up in external diff tool list but not in external merge tools. Even putting Beyond Compare in the Merge tool configuration yields greyed-out menu as you showed.
I use SourceTree on OS X also, diff and merge tool is FileMerge. The merge menu is greyed out in SourceTree 2.3.1 also.
Conclusion: The function isn't implemented in either version of SourceTree or it's broken in both.
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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