Description
In 2D mode, if the camera is set to orthographic, dragging the sprite from project to scene window throws 'Screen Position out of view frustum' error.

Steps To Reproduce:
1. Create a new project and Import any sprite.
2. Drag and drop the sprite in the scene view.
3. Repeat Step 2.
4. Observe that console throws an error.

Stack Trace : Screen position out of view frustum (screen pos 519.910828, 434.000000) (Camera rect 0 434 893 0) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Working fine on : Unity 2017.3.0f3, Unity 2017.2.0f3

Reproducible on : 2018.1.0b3, 2018.1.0a7, 2018.1.0a6, 2018.1.0a5, 2018.1.0a4, 2018.1.0a3, 2018.1.0a2, 2018.1.0a1

Environment : Occurs only on Mac