hide lower upper case differences
One thing that IDEs let you do is mass change your classes to conform variable references to the variable name using proper case
e.g. Integer myFoo;
referenced as myfoo++; // valid as apex is case insensitive
same with [select id from account] which per proper typography should be [SELECT id FROM Account]
since the IDE makes it so easy to do these mass changes; they still appear in the difference viewer as changed lines. It would be nice to extend the current "Hide reorderings" to also do "Hide upper/lower diffs"
This makes scanning through diffs go much faster while encouraging devs to use proper casing.