Igor Velikorossov

Thank you for the suggestion. As per our charter, we generally expose common controls provided by Windows, and the tab control is one of those. And you're right, is has...

Thank you. However, the biggest qestion here is how we test this? And ensure we haven't missed anything else... > Or better, I should just finish #7087 We're in RC1...

> I can help test this, possibly. It needs to be an end to end test like the drag & drop tests in `UIIntegration`, but the drag operation needs to...

I got a guidance from @eerhardt, putting it here for the future reference. . . . The way the linker is run in the dotnet/runtime repo is different than how...

> Basically less risky change would be undo these 2 changes in this file [#6976 (files)](https://github.com/dotnet/winforms/pull/6976/files#diff-efdc83ac4513276157401c19a46f9c20f7c2aa84d9b9eb1cd19f37aca86420d5R33) Would you be able to action this? The window for RC1 is closing fast.

> @RussKie Igor Velikorossov FTE - I now know how to write the automated test, dragging from Explorer, using [`IUIAutomation::GetFocusedElement`](https://docs.microsoft.com/en-us/windows/win32/api/uiautomationclient/nf-uiautomationclient-iuiautomation-getfocusedelement) and [`IUIAutomationElement::GetClickablePoint`](https://docs.microsoft.com/en-us/windows/win32/api/uiautomationclient/nf-uiautomationclient-iuiautomationelement-getclickablepoint). Your help has been invaluable. You're giving me...

> I'm unsure how to proceed with the test, should I create a separate issue? Yes please.

Thank you @kirsan31 for digging deep into this. The cursor is a system-wide singleton, and we're running many tests, and some of those are concurrent... I think it's plausible that...

Looking into it now.

Just to reiterate my understanding - we have a number of issues that we believe are all caused by the incorrect visibility handling of `TopLeftHeaderCell`. These issues are as follows...