Add a possibility to collapse/merge identical and successive rows in the Viewer

[altimac]

Hi!

Quite often I have numerous rows in the Viewer that are strictly identical (same message) and successive (not interrupted by another message). I would like to have a possibility to merge all those rows in one (with an indicator showing there are N merged rows) to ease readability of long logs. Of course a click somewhere would expand those rows back to normal.

Would be very handy! thx