getSelectedElems() returns an array with an incorrect length

[NeilFraser]

Use the selection tool to drag a selection rectangle over some items, then drag the rectangle so that it no longer selects any items, then release the mouse button.

The expected result is that canvas.getSelectedElems() would return an empty array.

But this function actually returns an array that has no contents, but has a length set to the number of objects dragged over. From the console:

Object.getOwnPropertyDescriptors(canvas.getSelectedElems())
length: {value: 4, writable: true, enumerable: false, configurable: false}

This manifests itself as a UI bug in the editor where action buttons are selected when they shouldn't be. Here's a video:
https://www.youtube.com/watch?v=cHw7ErNypno

[NeilFraser]

Found the source of the bug:

newSelectedItems.length = len;

https://github.com/SVG-Edit/svgedit/blob/master/editor/svgcanvas.js#L1114

Setting the length explicitly is redundant, and possibly wrong. Deleting this line resolves the problem.