Incorrect position for pasted blocks on RTL workspaces

[mikeharv]

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Description

With Blockly v12, there is a regression that causes the horizontal position of pasted/duplicated blocks to be inverted.

Reproduction steps

1. Load any RTL workspace, such as https://blockly-demo.appspot.com/static/tests/playground.html?dir=rtl&toolbox=categories
2. Place a block on the left or right side of the workspace, avoiding the middle.
3. Copy and paste (or duplicate) the block.

Stack trace

Screenshots

LTR (Working as expected)

RTL (Unexpected placement)

Browsers

No response

[cpcallen]

This is definitely a regression. Thanks for reporting it!