Edit control not drawing contents in Windows 7 when text exceeds a certain length
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Hi, I have a very strange problem with edit controls in Windows 7 (Ultimate), where once the number of characters exceeds a certain number, the contents become invisible. The text is still there, and can be copied, edited etc, but it is just not shown. Deleting characters makes it re-appear. I have reproduced this in a new MFC project, using Visual Studio 2010, just by making a dialog app which has a single-line edit control on its dialog. I have found that the exact number of characters required to make the text disappear depends on the text. For instance, filling the control with the letter 'i', it takes 16379 chars to become invisible, but for the letter 'W' it takes 3275. For '_', it takes 5459. I wondered if it was the size in pixels that caused the problem, and found (using GetTextExtent on the edit control's DC) that for the letter 'i' the width was 65516 pixels, 'W' was 45850 pixels, and for '_' was 43672 pixels, so I can't see any relationship there. (I am building the app in Visual Studio 2010 on Vista, though that doesn't make any difference, as an old version of our app built in VS2005 behaves the same in Win7). Does anyone have any ideas of what is going on? Paul.
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