Get the successive click count for the current mouse click.
button
ImGuiMouseButton index: 0 left, 1 right, 2 middle.
Click count reported this frame: 0 for none, 1 for a single click, 2 for a double click, and so on.
return the number of successive mouse-clicks at the time where a click happen (otherwise 0).
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Get the successive click count for the current mouse click.