Several nested splitters in Sequence View make resizing inconvenient

Sequence View includes several subviews: Detail View, Zoom View, Annotations View, etc. These views are organized by several nested splitters, so if you drag an outer splitter delimiter, inner widgets are resized. But if you drag a delimiter of the inner splitter, outer widgets are not resized. If you want to enlarge all inner widgets you are compelled to drag the outer splitter delimiter first.