EntityE layout fix

plugins/org.jkiss.dbeaver.ui.navigator/src/org/jkiss/dbeaver/ui/editors/entity/properties/ObjectPropertiesEditor.java

@@ -251,6 +251,10 @@ public class ObjectPropertiesEditor extends AbstractDatabaseObjectEditor<DBSObje
 //        if (propsPlaceholder != null) {
             Point propsSize = propsPlaceholder.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
             Point sashSize = sashForm.getParent().getSize();
+            if (sashSize.x <= 0 || sashSize.y <= 0) {
+                // This may happen if EntityEditor created with some other active editor (i.e. props editor not visible)
+                sashSize = getParentSize(sashForm);
+            }
             if (sashSize.x > 0 && sashSize.y > 0) {
                 float ratio = (float) propsSize.y / (float) sashSize.y;
                 int propsRatio = Math.min(1000, (int) (1000 * ratio));