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POWhy do multiple font sizes display inside Plain TextBox?
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  1. POWhy do multiple font sizes display inside Plain TextBox?
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    copied!<p>This is not a question about how to change the font size. Rather, why is the size of my font changing by itself as I type (or paste) when it's inside a plain <code>TextBox</code> control which, as you should know, only supports one color, one font, and one font size at any given time.</p> <p>My code:</p> <pre><code>using(FontDialog d = new FontDialog()) { // The usual properties... if(d.ShowDialog() == DialogResult.OK) { textbox1.Font = d.Font; } } </code></pre> <p>The font is set at 8pt. If I paste plain text into it, the top line will be 9 to 10pt while the bottom line is noticeably smaller (about 8 pt).</p> <p>It doesn't matter which font, font style, or font size I choose; this keeps happening!</p> <p><img src="https://i.stack.imgur.com/LJup5.png" alt="enter image description here"></p> <h1>Update</h1> <p>Thanks for all your help thus far.To answer your recent questions below:</p> <p>My app is targetting .NET 4.5.</p> <p>There's no mix up in the code, since I was able to reproduce this problem in a new Windows Forms project with nothing but a Form, a TextBox and a Button that calls the FontDialog.</p> <p>To answer the question about my Video drivers, I did require support for an app I purchased a few weeks ago and they told me to run DXDiag, they got back to me saying my Video Card driver is out of date, however I didn't think it was because I always check every few months. I then went to the manufacturer's website and it said that I already have the latest drivers installed for my system.</p> <p>Windows Update also says there are no new available updates. I'll check for a new version of drivers again, though.</p> <hr/> <p>I also did a test in a new blank project where I display the font being used by the TextBox <em>before</em> calling FontDialog.ShowDialog(), and after it has been shown and after the new font has been set and everything matches - yet there is still the issues after changing font/font size inside the textbox.</p>
 

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