Code review: add design to differentiate whitespace with tabs
## Description of the proposal Currently on Gitlab, we are not able to differentiate, in code review, whitespaces and tabs. I suggest as some IDE do, to replace whitespace by a fade dot. Here a suggested design for whitespaces (vs tabulation and non-breaking spaces which don't have design): ![Capture_d_écran_2019-11-18_à_17.11.41](/uploads/da15a757519aae1ad03f0e3b3eb3c7d3/Capture_d_écran_2019-11-18_à_17.11.41.png) \~"feature proposal"
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