Sorting affects all models

Steps to reproduce:

• Create a new project
• In Model Editor, import attached test_data.csv with name "Model1"
• Right-click on top of first column and select "Sort Ascending"
• Open "book" model
• -> First column of the book model is also sorted, not expected.
• Import the attached test_data.json with name "Model2"
• -> First column of the "Model2" is also sorted, not expected
• Expected is that first column of only Model1 is sorted.