#4310-deselect-all-BOM-bug

[glickgNU]

Changes

The select all checkbox no longer chooses everything when every material is already selected

Test Cases

• When every material is selected, clicking the checkbox deselects everything
• When there is at least one material unselected, clicking the checkbox deselects all materials
• When all materials are deselected, clicking on the checkbox selects them all.

Checklist

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Closes #4310

[staysgt]

Good work!