Chamfer popup window opens with size 0 (invisible)

[AmitloafTotes]

On unity 2018.3 - it appears that when the height is 0, OnGui doesn't run so it doesn't automatically set the window's height. Need to give it some starting height.

Change line 49 in ToolSettingsPopup.cs from
private float m_Height = 0.0f;
to
private float m_Height = 10.0f;
to fix this