Terrain: trees hidden while painting texture

Hi, I have an issue where while I am holding down the click to paint my terrain with a layer all the trees are hidden and when I release, they reappear. What's causing this and how can I make it not do this?

 

That's by design, terrain painting would otherwise slow down to a crawl.

 

Is there a way to turn it off though? The flashing of the trees in and out makes me feel sick similar to flashing lights

For now I went to Terrain Settings > Tree & Detail Objects > Draw and clicked it off to hide the trees but it'd be better if I could just have the trees always drawn while I'm editing terrain

 

Hey, I took the source code from the original paint texture tool from unity and added some changes that should not hide tree's while painting: https://pastebin.com/xMxnHua2
Copy the code from the pastebin code > Create a new script under "YourProject/Assets/Editor" called "CustomPaintTextureTool.cs".
You will now find a new tool in the "Paint Terrain"-dropdown, called "Paint Texture Custom".

Explanation: I found the source code here https://github.com/Unity-Technologi.../TerrainEditor/PaintTools/PaintTextureTool.cs
I renamed the class, renamed the tool name, and set OnPaint to return false (as @wyattt_ said in his reply).
NOTE: I haven't tested this class, and you might need to have TerrainTools installed for this to work (https://docs.unity3d.com/Packages/com.unity.terrain-tools@4.0/manual/index.html). I'm at work and can't test it at the moment