drag and drop stops working with external-message-pump

[orhun]

Hi,

If I run 'cefclient.exe --external-message-pump --url=http://html5demos.com/drag', the drag and drop doesn't work as expected.

• The drag icon doesn't switch to enabled when you move the item to the drop rectangle area.
  
• If you drop it there anyway, now the second drag always shows the 'enabled' drag icon anywhere.
  
• Since it is enabled now you can actually drop the item in the drop rectangle box.

It looks like with external-message-pump enable/disable states are not updated correctly and out of sync with mouse events. It looks like it is working as expected with 'multi-threaded-message-loop'.

I am using 3.2924.1575.g97389a9, but I was able to replicate the problem with 3.3163.1671.g700dc25 as well.

Any pointers how I could workaround the issue for my version (3.2924.1575.g97389a9) is greatly appreciated. I can't switch to 'multi-threaded-message-loop'.

Thanks.

[Czarek]

I don't think external message pump is well tested on Windows, since multi threaded message loop gives best performance, thus it is recommended instead.