Bug in deconstruction minification

[Reinmar]

I've been testing how Babili works with CKEditor 5 and I encountered a bug with swapped variable names.

I tried to debug it and the smallest possible scenario is minifying this function: https://github.com/ckeditor/ckeditor5-utils/blob/d3702f4d396849ab3e67358ef74fb670133b4e89/src/dom/position.js#L78-L113

If you pass it through Babili (see on REPL) the name property in the return value is set to bestPosition from line 93.

We had this:

[ name, bestPosition ] =
getBestPosition( positions, targetRect, elementRect, limiterRect, viewportRect ) 

// ...

return { left, top, name };

And we get this:

[i,j]=getBestPosition(c,h,g,m,n)

// ...

return{left:k,top:l,name:j}

[Reinmar]

Fun fact, if you swap order of variable definitions to:

	let name;
	let bestPosition;

everything is ok.

[boopathi]

Related #326, #369. #390 fixes it and is already merged to master.