Delete button not being re-enabled

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

When the Parameters page gets disabled and then re-enabled, the Delete button is not re-enabled, even if it should be. To reproduce this, create a sphere large enough that progress is displayed and the Parameters page is disabled. When the sphere finishes rendering, everything except the Delete button is re-enabled, even though there are no filters using the output of the sphere.

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