adding a block creates 2 undo-redo actions and undoing/redoing twice breaks editing

[bago]

Steps:

• add a block
• undo once (the block is still there: 1st bug)
• undo again
• redo twice
• undo twice
• redo twice (now the editable texts are no longer editable).

Sounds like this is related to the uniqeId assignment for blocks.