ITextView.ViewportLeft Property
Visual Studio 2015
Gets or sets the position of the left edge of the viewpoint in the text rendering coordinate system.
Assembly: Microsoft.VisualStudio.Text.UI (in Microsoft.VisualStudio.Text.UI.dll)
When set, the horizontal offset is clipped to [0.0, Max(0.0, formatted text width - viewport width)] on non word-wrapped views, and [0,0] for view in which word-wrap is enabled.
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