Holding a block near the edge of the workspace should scroll it

Expected Behavior

In the 2.0 editor there was a feature where if you drag a block and hold it over the edge of the workspace, lingering there for a moment (but not releasing it), the workspace will start to scroll towards that edge. The speed at which it scrolled depended on how close to the edge of the screen the cursor was (with being right on the edge scrolling the quickest).

I recommend you try it out yourself (see steps to reproduce section).

Actual Behavior

This feature doesn't exist in 3.0!

Probably several people have noticed this feature's missing, but someone specifically mentioned it to me while discussing 3.0: https://scratch.mit.edu/projects/276664399/#comments-106008387

Steps to Reproduce

First set up your workspace so that the scrollbars are visible. In 3.0 that's already always the case; in 2.0 you'll have to make the workspace extend past the visible screen, e.g. by dragging out a block to the bottom right corner then zooming in.

Grab a block and drag it over the edge of the screen. Note that nothing happens in 3.0, whereas the expected behavior I described does in 2.0.

Start by comparing the 2.0 editor's block-drag behavior with the 3.0 workspace, following the block drag and workspace scrolling entry points. Reproduce the issue with visible scrollbars and verify that holding a block near each screen edge scrolls toward that edge, with speed increasing closer to the edge.