System Information
Operating system: Ubuntu 18.04
Graphics card: NVIDIA titan Black
Blender Version
Broken: 2.90 fd8d245
Worked: 2.83
Short description of error
New search is not able to find Flip Region operator.
If you type Flip Region in it, it is not found.
Calling this operator by search was the only way to do it with default keymap of previous releases and master.
Because of Region Overlap preference enabled by default, it is not possible to access Right Click menu relative to a region in 3DView operator.
So, if a new user wants to flip toolbar to right side, he will conclude that operator was removed or limited to Tool Settings bar and Header.
But it is not the case, user can still create a shortcut to flip toolbar and sidebar.
( It would be appreciated to be able to flip Adjust Last Operation panels and navigation gizmos, too.
Adjust Last Operation panel is taking space.
It would be great to be able to automatically fuse it in Sidebar when it is on same side or completely opened Toolbar like in 2.79.)
Exact steps for others to reproduce the error
Press F3 & type "Flip" in search.
