caret under MSW

[Harry]

The caret under MSW only works in simple cases.
For example, if I hide the caret when processing a click on a button, 
the caret only hides itself when the cursor
leaves the button and is hovering back over the window.
Also, if clicking a button repositions the caret, sometimes an 
anti-caret artifact stays on until the window is manually refreshed.

The problem with the wxWidgets implementation of the caret under MSW is 
that it does everything by the book.
However, the caret implementation of Windows has always been somewhat 
inadequate.

When programing the caret under MSW, I've always done the following:
1. I never hide the caret, as this sometimes works in an unexpected way :
I always destroy and recreate instead of hiding and showing.
2. I never depend upon Windows to refresh the screen when moving or 
hiding the caret :
I always refresh the old position of the caret.

Doing the above fixed my caret display problems under wxWidgets (I used 
wxCaret::OnKillFocus() to destroy the caret).

I believe that a more robust wxWidgets caret implementation is required 
under MSW.

Harry