Adjust RichTextBox font size under High DPI setting

Question

My C# application includes grids with both simple text boxes and richtext boxes. Often the richtext boxes contain rich text copied and pasted from elsewhere, and often the rtf markup includes hardcoded font size (\fsXX, XX in half points). In most cases the rich text font size is the same or close to the simple text font size.

When the DPI scaling is set to anything other than the default 96 the rich text is distorted as follows:

a) When the application is NOT set to be DPI aware the richtext is shown smaller than the simple text and is blurry.

b) When the application is set to be DPI aware the rich text is larger than the simple text.

Is there a means to allow or force the richtext to scale with the simple text, short of editing the markup directly?

Answer 1

One thing that might solve the problem is to set the RichTextBox on a form and set the AutoScaleMode property of the form to None (AutoScaleMode Enumeration documentation)