Click with "SendWindowMessage" Triggered Drag and Drop

I have upgraded to 2018.4 version form 2016.2 version recently.(Enterprise Edition)
During development like find collection of element children and click each child element,
We found that the single click activity with “SendWindowMessage” has subtle different between 2016.2 version and 2018.4 version.
I suspect click down activity is becomed more longer time and click up activity is becomed late in 2018.4 version, even can easily trigger drag and drop event, depending on where hover of cursor over on screen.
However, 2016.2 version is no problem.

Click activity is the most basic in robot process, and therefore the problem is hardly to detour.
I need some help, please tell me why happened and how to resolve.

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Hi @wusiyangjia

Could you elaborate on the issue and provide some examples?

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Sorry, my application runs on an internal network, so I can’t provide example of the issue.
But I found something new about the issue.
With version 2016.2, single click activity with “SendWindowMessage” does not lose the cursor where hover on screen.
However, with version 2018.4, the cursor was lost at the click moment, just for an instant.
You can see that with a simple program like below.
(keep your mouse hover on an element that has hover event)

I think that’s why my app was triggered drag and drop events,
and this problem may affect many users.
Thanks for your reply.

Hi @wusiyangjia

I would urge you to create a ticket with our technical support.

They will investigate it.