Force Unity to stop playing if you have edited a source file. Helps avoid some editor crashes and false positives / error spam. To use, drop this script in an "Editor" folder in your project.

StopPlayingOnRecompile.cs

using UnityEditor;

[InitializeOnLoad]
public class StopPlayingOnRecompile
{
	static StopPlayingOnRecompile()
	{
		AssemblyReloadEvents.beforeAssemblyReload += () =>
		{
			if (EditorApplication.isPlaying)
			{
				EditorApplication.isPlaying = false;
			}
		};

		AssemblyReloadEvents.afterAssemblyReload += () =>
		{
			if (EditorApplication.isPlaying)
			{
				EditorApplication.isPlaying = false;
			}
		};

		EditorApplication.update += () =>
		{
			if (EditorApplication.isCompiling && EditorApplication.isPlaying)
			{
				EditorApplication.isPlaying = false;
			}
		};
	}
}

This current version was updated to work with Unity 2017+