Suppressing mouseover call while dragging

[sumitagarwal]

In my panel I use a mouseover call to update a modulator from a value from my device and I use a drag call to send a value for the same parameter to the device.

As you might imagine, essentially reading and writing the same data in quick succession can result in wonky knob behavior, especially if the the rate of writes and reads begins to overwhelm the device.

It seems to me like the obvious fix is to block the mouseover call anytime the mouse button is down regardless of where the cursor is on the canvas. But I can’t figure out how to do this.

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