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A) there is no way how to redesign the pane during design time. If you put a component to the left side then you can`t switch the component to right - suggestion C) properties leftComponent, rightComponent do not reflect the actual state. Even their modification do not change anything (although the code is generated but precedes the original one in source of i nitComponents method) B) there is no property in the Layout tab of a component, placed in JSplitPane, which tells the current position (left, right) - this may be suggestion to implement it soon.
Priority is changed to P4 (normal).
Bug assigned to the module owner.