fix: account for divider size in pane calculations#874
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Previously, percentage-based pane sizes were calculated against the full container size, ignoring the space taken by dividers. This caused panes totaling 100% to overflow their container by the combined width of all dividers. Changes: - Add `dividerSize` prop (default: 1px) to SplitPane for accurate sizing - Subtract total divider width from available space before calculating percentage-based pane sizes - Apply same adjustment when redistributing pane sizes on container resize - Update tests to verify correct behavior with divider width accounting Fixes #871
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Summary
dividerSizeprop (default: 1px) to enable accurate pane size calculationsRoot Cause
Previously, percentage-based pane sizes were calculated against the full container size, ignoring divider space. For example, with 3 panes at 33%/34%/33% and two 8px dividers, the panes would total 100% of 1024px = 1024px, plus 16px of dividers = 1040px total (overflow).
Test Plan
Fixes #871