Speedup *-All operations on larges files

[christianstaib]

After some investigation for eclipse-jdt/eclipse.jdt.ui#1575, we discovered that "Format-All" is also slow:

It might be sensible to explore a mechanism to speed up *-All operations on large files.

As far as I understand, these operations are chained together by individual steps that are valid on their own but are therefore more expensive than executing multiple operations that may temporarily enter an invalid state and then clean up the state in a single step afterward.

There might be some scenarios where the current approach (chained individual operations) is faster.