PEP event just firing every second time

[OrellBuehler]

Browser: Google Chrome
Version 49.0.2623.112 m (64-bit)
Example: [http://codepen.io/OrellBuehler/pen/aNjwrG]
PEP-Version: 0.4.1
jQuery: 1.9.1
Event-Type: pointerdown
Description: When you first click on an element with a pointerdown listener then the event gets fired. If you then click on the same element the event doesn't get fired(thats the problem). But if you click beside the element and then on the element the event gets fired again.

[bethge]

Thank you for raising this issue and giving an example!

The second pointerdown should certainly get fired.

The alert-popup seems to swallow the mouseup, which PEP uses to maintain the state of currently pressed buttons. On the second click the pointerdown is not triggered because PEP thinks the mouse button is still pressed, since no mouseup event occurred.

As long as you don't call alert-popups from pointerdown listeners, pointerdown should fire events properly.

[scottgonzalez]

We have to deal with this in jQuery UI too. We have a flag that indicates that the mouse button is being pressed and if we detect a mousedown while this flag is set, we act as if a mouseup just occurred and then continue processing the mousedown. In the jQuery UI case, we only care about the left button, so the code is simpler, but we can take a similar approach in PEP. https://github.com/jquery/jquery-ui/blob/010f5f9d13b7d6f1c13482825547ee95d3033e40/ui/widgets/mouse.js#L82-L83

Seems like this is also related to #219.