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Formatting
Inject DiffDCs when the entire file is replaced.
Use line-based diffs instead, which looks much more familiar.
The entire file replacement is handled for the past history as well.
The past history DiffDC's are correctly added to the timeline.
Seems like the bugs related to injecting diffDCs are corrected.
Use dimmed colors for indicating external changes.
Merge branch 'feature/runtime_history' into develop