Reset updates object on every zoomDone

[etpinard]

... so that 'old' keys from two-sided zoomboxes don't trickle into single-side zoombox updates.

Fixes #3026, which was made apparent staring from v1.40.0 (and PR #2823), as we no longer run a calc edit when autoranging cartesian axes (e.g on double-click).

This one is fairly bad bug, so I'll make a release as soon as this thing is merged.

cc @alexcjohnson @antoinerg

[etpinard]

Note that the same updates object is also "reset" in

plotly.js/src/plots/cartesian/dragbox.js

Lines 598 to 647 in 7c03fb4

	// Draw ticks and annotations (and other components) when ranges change.
	// Also records the ranges that have changed for use by update at the end.
	function ticksAndAnnotations(ns, ew) {
	var activeAxIds = [],
	i;
	function pushActiveAxIds(axList) {
	for(i = 0; i < axList.length; i++) {
	if(!axList[i].fixedrange) activeAxIds.push(axList[i]._id);
	}
	}
	if(editX) {
	pushActiveAxIds(xaxes);
	pushActiveAxIds(links.xaxes);
	}
	if(editY) {
	pushActiveAxIds(yaxes);
	pushActiveAxIds(links.yaxes);
	}
	updates = {};
	for(i = 0; i < activeAxIds.length; i++) {
	var axId = activeAxIds[i];
	doTicksSingle(gd, axId, true);
	var ax = getFromId(gd, axId);
	updates[ax._name + '.range[0]'] = ax.range[0];
	updates[ax._name + '.range[1]'] = ax.range[1];
	}
	function redrawObjs(objArray, method, shortCircuit) {
	for(i = 0; i < objArray.length; i++) {
	var obji = objArray[i];
	if((ew && activeAxIds.indexOf(obji.xref) !== -1) ||
	(ns && activeAxIds.indexOf(obji.yref) !== -1)) {
	method(gd, i);
	// once is enough for images (which doesn't use the `i` arg anyway)
	if(shortCircuit) return;
	}
	}
	}
	// annotations and shapes 'draw' method is slow,
	// use the finer-grained 'drawOne' method instead
	redrawObjs(gd._fullLayout.annotations || [], Registry.getComponentMethod('annotations', 'drawOne'));
	redrawObjs(gd._fullLayout.shapes || [], Registry.getComponentMethod('shapes', 'drawOne'));
	redrawObjs(gd._fullLayout.images || [], Registry.getComponentMethod('images', 'draw'), true);
	}

which is called on pan and scroll.

[alexcjohnson]

Thanks for the quick work! 💃
Could probably simplify and prevent this kind of issue by only constructing updates when required and passing it in to dragTail... but that's a bigger project, lets get this out!