RTL horizontal scrolling is broken while moving columns

Scrolling the grid while moving columns doesn't seem to be working for RTL. I'm running Windows 10 and have seen the issue in Chrome, FF, and IE11. Trying to move a column to the left doesn't scroll at all, but then when I drag the same column back towards the right side of the grid, the grid scrolls to the left. Here's a plunkr (based on the example in the column moving tutorial) demonstrating this.

1. Click and hold the right-most column header ("Id" in this case).
2. Drag the column to the left side of the grid.

Notice that the grid did not scroll to the left even though it should have. Now, if you drag the column back to the right side of the grid, you can see the grid scroll to the left when it shouldn't have scrolled at all.