Version 4.4.1, 4.4.2 both reappear the bug. I don’t have .net4.5 on my computer, so I don’t know whether Version 5 beta has the same problem.
When I edit a xaml file which contains a mass of buttons, after I select a button, the adorner of the button appears in top left corner of the page in wpf designer, rather than surround the control. It looks like this:
https://www.dropbox.com/s/j46w6tvogdvlsf0/bug-button.png
But when I select a textbox, it’s OK.
https://www.dropbox.com/s/t4o7ey9rzt9hr1j/bug-textbox.png
Then I did some experiments, might be helpful to fix the bug.
Only when the number of controls become more than about 130, the bug reappear;
The bug only appear on some kind of control, ContentControl like Button, Label, Groupbox etc, Panel like Canvas, Grid etc.
When the adorner appears in a wrong position, you can still drag the control, and after that it will appear in write position, but the adorner appears in a wrong position after the next select operation.
Here’s my xaml file, it has nothing special except it contains a mass of buttons.
https://www.dropbox.com/s/e87wywsjbu5qc6w/bug.xaml
I tried to read the source file to fix the problem, but it’s too complexity for me to understand the code now, so I ask for help here.
The #develop is a great project, I learned a lot from it, thanks for all the contributors.