Gets or sets the size of a single line of text within the System.Windows.Forms.RichTextBox control.
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When a value greater than zero is entered into the control, a nonvisible margin is placed in the control at the specified number of pixels from the left side of the control. Any text that is entered that extends beyond this margin is placed on the next line of text in the control. This property affects all text currently entered into the control as well as any additional text entered into the control after the property is set. You can use this property to specify a maximum line width for all text entered into a System.Windows.Forms.RichTextBox control.