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When minimum size is set for a TopComponent in editor position, the horizontal split pane doesn't actually allow to set the expected minimum height. This problem is due to the wrong calculation of the minimum height in TabbedAdapter: it uses a BorderLayout with a JPanel containing the TopComponent in CENTER position and a TabDisplayer in NORTH position. The minimum size calculation for the TabDisplayer is delegated to BasicScrollingTabDisplayerUI, which returns the minimum of the selected component as minimum size, so the minimum height of the TopComponent is counted twice, one for the NORTH and one for the CENTER component.