I’m trying SourceTree 18.104.22.168 on Windows 7x64.
The problem is that SourceTree doesn’t show content of files that have more than 99 rows.
I tried to change settings in Tools -> Options -> Diff
Max File Count: 10
Size Limit (Text): 1024 Kb
Max Diff Line Count: 10000
Size Limit (Binary): 10240 Kb
But it doesn’t help. Seems like these settings don’t have any effect at all.