Function resolveCodeViewportWidth

src/ui/diff/codeColumns.ts:128–143

(
  layout: Exclude<LayoutMode, "auto">,
  width: number,
  lineNumberDigits: number,
  showLineNumbers: boolean,
)

/** Clamp horizontal reveal against the narrowest code viewport in the active layout. */
export function resolveCodeViewportWidth(
  layout: Exclude<LayoutMode, "auto">,
  width: number,
  lineNumberDigits: number,
  showLineNumbers: boolean,
) {
  if (layout === "split") {
    const { leftWidth, rightWidth } = resolveSplitPaneWidths(width);
    return Math.min(
      resolveSplitCellGeometry(leftWidth, lineNumberDigits, showLineNumbers).contentWidth,
      resolveSplitCellGeometry(rightWidth, lineNumberDigits, showLineNumbers).contentWidth,
    );
  }

  return resolveStackCellGeometry(width, lineNumberDigits, showLineNumbers).contentWidth;
}