Drag to select crop UI is broken

[jywarren]

#205 added this nice interface for cropping -- drag selection -- and #229 was supposed to build on this. However it seems broken now --

Looks like we're running imgAreaSelect on imgEl here:

image-sequencer/src/modules/Crop/Ui.js

Lines 74 to 77 in 0e7323e

	// step.imgSelector is not defined, imgElement is:
	function imgEl() {
	return step.imgElement;
	}

But sequencer.steps[1].imgElement doesn't return anything anymore. It's supposed to be set here:

image-sequencer/examples/lib/defaultHtmlStepUi.js

Line 71 in 985c678

step.imgElement = step.ui.querySelector("a img.img-thumbnail");

And $("a img.img-thumbnail"); still returns elements, so that /should/ work...

Did I break it here?

https://github.com/publiclab/image-sequencer/pull/960/files#diff-8fab943ef984aa24b7a63cbe4442daeaR71

Would love help fixing this! Then we should write a UI test for it -- send a click event to the image, and ensure that a selection box appears.

[vibhorgupta-gh]

Looking into this and other relevant crop module issues.