title: Form Designer showing blank tab when opening form
body: <p>I have one particular form which is not being rendered in the form designer. I just get a blank screen:</p>
  <p><a href="https://i.stack.imgur.com/eVyDm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eVyDm.png" alt="enter image description here" /></a></p>
  <p>The code builds and runs successfully. The form works fine at runtime.</p>
  <p>I've checked and re-checked the <code>csproj</code> file. Everything is fine. <code>InitializeComponent</code> is called in the form's constructor.</p>
  <p>I just upgraded to Visual Studio 2019 (16.11.5) and I also tried opening the form in the latest preview of Visual Studio 2022. Nothing is working.</p>
  <p>Any ideas on how I can fix this problem?</p>