Breaks redo stack

[ericbiewener]

Sometimes I'll undo a bunch of code changes and save the file to see how the application looked in a previous state, then redo all the changes to continue working from where I left off. When using "format_on_save": true, this plugin breaks that redo stack.

The same issue occurs with Sublime's trim_trailing_white_space_on_save setting.

I might just need to stop using this undo/redo approach since it is admittedly dangerous even without being broken in the way described in this issue.