Button style=link triggers no events
Sometimes no events are fired at a button when the style is set to "link". style: link sets the following values:
Probably by overlaying the transparent button with other transparent areas the alpha value becomes too small and reaches rounded 0. Pixi doesn't fire events if alpha is 0, hence the workaround with the very small numbers.
See button.js line 116 and 177 ff.
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