Full Param Tree doesn't clear highlighting after "Refresh Params" is pressed

If I push the "Refresh Params" button any green highlighting should be cleared.

Here's how to recreate the issue:
1. open Full Parameter Tree
2. change a parameter but don't push the "Write Params" button
3. push the "Refresh Params" button. The green highlighting remains.

Clicking away from the Full Parameter Tree and back again clears the highlighting issue.

Start by locating the Full Parameter Tree and the code handling the "Refresh Params" button, then reproduce the sequence of changing a parameter without writing it and refreshing. The issue is done when refreshing clears all green highlighting immediately, without needing to leave and reopen the tree.

Written by the indexing model from the issue text.