Function resolveStackCellGeometry

src/ui/diff/codeColumns.ts:112–125

(
  width: number,
  lineNumberDigits: number,
  showLineNumbers: boolean,
  prefixWidth = DIFF_RAIL_PREFIX_WIDTH,
)

/** Resolve the stack-cell gutter and code viewport after the left rail prefix. */
export function resolveStackCellGeometry(
  width: number,
  lineNumberDigits: number,
  showLineNumbers: boolean,
  prefixWidth = DIFF_RAIL_PREFIX_WIDTH,
) {
  const availableWidth = Math.max(0, width - prefixWidth);
  const gutterWidth = Math.min(availableWidth, showLineNumbers ? lineNumberDigits * 2 + 5 : 2);

  return {
    gutterWidth,
    contentWidth: Math.max(0, availableWidth - gutterWidth),
  };
}

/** Clamp horizontal reveal against the narrowest code viewport in the active layout. */
export function resolveCodeViewportWidth(