MRWidget: Implement new design for nothing to commit state.

Fatih Acetrequested to merge
acet-mr-widget-nothing-to-commit-state into master

Things to do

  • Fix mock canCreateFile
  • Add tests

Screenshots

Screen_Shot_2017-05-10_at_23.10.15

Screen_Shot_2017-05-10_at_23.10.30

Screen_Shot_2017-05-10_at_23.10.53

Fixes #29320 (closed)

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