Recenter issue with a horizontal toolbox

[AnmAtAnm]

Problem statement

If a toolbox has a horizontal toolbox, recentered blocks will be far right of the workspace center, possibly outside the normal draggable bounds.

Expected Behavior

After pressing the recenter button, blocks should be centered in the workspace. It the blocks fit, they in the visible space, they should not bleed off the workspace edge.

Actual Behavior

Steps to Reproduce

1. Start by opening tests/multi_playground.html.
2. In any horizontal toolbox workspace (bottom four on page), add blocks from the toolbox.
3. Hit the recenter button.

Notice how the blocks are not centered, shifted to the right.

Perhaps the toolbox length is being included in the horizontal workspace width?

[alschmiedt]

Closing as I can no longer repro.