Werk #13153: BI visualization: fix undo/redo and interactive resizing

Component	User interface
Title	BI visualization: fix undo/redo and interactive resizing
Date	Sep 17, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The undo/redo buttons and resizing via mouse drag were not functional in the layout designer. This is fixed.

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