The brush is not switching to "Circle" on selecting paint trees tab. With old terrain tools on selecting "Paint trees" tab the brush used to switch to it.

Right now the brush being rendered is the one which the user has selected under other paint tools, however, the functionality works same as "Circle" brush

If the user is allowed to paint trees according to the selected brush, then it is not working. In this case, to change the brush type user has to go back to other paint tools and change it, we should add brush selection settings under paint tree tab, as the same options are available for painting detail.

Steps to repro:
1. Open attached or create a new project
2. Hierarchy > right click
3. 3D object > terrain
4. Under raise/lower height select star or any other brush
5. Select paint trees tab
6. Edit tree> add a speed tree or prefab and paint

Actual Result:
1. Trees are not being painted according to the rendered brush

Expected Result:
1. Painting should work same as the rendered brush and options to change brush should be available under "Paint trees" tab or it should switch to the default "Circle" brush

Occurring with:
2018.3.0a8, 2018.3.0a4

Note:
New Terrain tools are introduced from alpha 4

Environment:
Windows and Mac