Fix potential errors from the swap layers history item#2214
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The previous implementation removed both layers before inserting them at the new locations. If there were only two layers this left the document temporarily in an invalid state, which could produce errors in event handlers for the LayerRemoved events Fixes: #2139
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The previous implementation removed both layers before inserting them at the new locations. If there were only two layers this left the document temporarily in an invalid state, which could produce errors in event handlers for the LayerRemoved events
Fixes: #2139