Function ensureBorderStyleFallback

packages/editor/src/utils/styles.ts:271–288

(
  styles: Record<string, string | number>,
)

 * fallback so borders show up immediately after setting a width.
 */
export function ensureBorderStyleFallback(
  styles: Record<string, string | number>,
): Record<string, string | number> {
  for (const [widthKey, styleKey] of Object.entries(BORDER_WIDTH_TO_STYLE)) {
    const widthValue = styles[widthKey];
    if (!widthValue || widthValue === '0' || widthValue === '0px') {
      continue;
    }
    if (!styles[styleKey]) {
      // Keep shorthand borderStyle authoritative for each side when present.
      if (styleKey !== 'borderStyle' && styles.borderStyle) {
        continue;
      }
      styles[styleKey] = 'solid';
    }
  }
  return styles;
}

/**
 * Resolves conflicts between reset styles and inline styles by expanding