I guess this has been discussed before in here: https://answers.atlassian.com/questions/156779/difference-in-diif-suppression-between-windows-and-mac-sourcetree
Hopefully it helps!
I'm on a Mac and file up to 1Mb work fine. I don't know if the 1.8Mb is the reason for the message - diff suppressed (file size or pattern) or is it "pattern". I don't know what "pattern" means. The file compares OK when using the "External Diff" button which starts FileMerge on my MacBook Pro (OSX 10.8.3)
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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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