Function updateSizeFromRect

src/components/SplitPane.tsx:241–251

(rect: { width: number; height: number })

    if (!container) return;

    const updateSizeFromRect = (rect: { width: number; height: number }) => {
      const rawSize = direction === 'horizontal' ? rect.width : rect.height;
      // Round to nearest integer to prevent sub-pixel variations from causing
      // resize feedback loops (fixes #873)
      const size = Math.round(rawSize);
      if (size > 0 && size !== lastObservedSizeRef.current) {
        lastObservedSizeRef.current = size;
        setContainerSize(size);
        handleContainerSizeChange(size);
      }
    };

    const resizeObserver = new ResizeObserver((entries) => {
      const entry = entries[0];