Ex : On changing Dimensions from original in video import settings, Aspect ratio dropdown appears and slides right to get aligned with other options

Steps to Reproduce:
1. Create a new project.
2. Import a video in the project tab
3. Select video > Import settings > Transcode > Enable
4. Dimensions > Select any dimension from the dropdown

It seems the problem is related to EditorGUILayout.BeginFadeGroup(), indentation is broken during fade transition.

Note: this behaviour also happens on the following Components : Light (changing Shadow Type), BoxCollider2D(toggling Used By Composite)

Actual Result:
Aspect Ratio drop-down appears and moves right to get aligned with other options

Expected Result:
Aspect Ratio drop-down is aligned properly with other option without any movement after its visible

Reproducible on:
2019.1.0a12, 2018.3.0f2, 2018.3.0a3

Not Reproducible on:
2018.3.0a2, 2018.2.0f2

Environment:
Occurring on both Windows and MacOS