I did some experiments with JS as Thomas suggested. Found Chrome & Opera 
firing a mouseMoved event in the end of the sequence: mouseDown, mouseMove, 
mouseUp.

Firefox and MS Edge on the hand behaved as expected - means, the last fired 
event was mouseUp.
Safari on Mac - is inconclusive. The touchpad works as expected, mouseUp 
was the last event fired. With a mouse it's mixed.

Below is the test code.

<!DOCTYPE html>
<html>

<head>
    <script>
        function mouseDown() {
            document.getElementById("myDiv").style.background = "red";
        }

        function mouseUp() {
            document.getElementById("myDiv").style.background = "green";
        }

        function mouseMove() {
            document.getElementById("myDiv").style.background = "blue";
        }

        function mouseOut() {
            document.getElementById("myDiv").style.background = "white";
        }
    </script>

    <style>
        div {
            height: 200px;
            width: 50%;
            background-color: powderblue;
            font-family: Verdana;
            border: 2px solid black;
        }
    </style>

</head>

<body>
    <div id="myDiv" onmousedown="mouseDown()" onmouseup="mouseUp()" 
onmousemove="mouseMove()" onmouseout="mouseOut()" />
</body>

</html>

On Sunday, September 2, 2018 at 11:29:49 AM UTC-4, Velusamy Velu wrote:
>
> I should have been more careful about what I claimed. Probably my claim 
> that "causes GWT to register a mouse move" is wrong. I think you are right, 
> those events are dispatched by the browser. I haven't tried JS yet.
>
> On Sunday, September 2, 2018 at 4:44:22 AM UTC-4, Thomas Broyer wrote:
>>
>> Could it just be the events your browser dispatches? Have you tried in 
>> pure JS?
>
>

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