Answer the stability pass: the slot a line ending reached, and the text an image description dropped

src/markdown/emit/inline-line.ts

@@ -3,16 +3,16 @@ import type { InlineDirective } from '../../adf/inline-directives.ts'
 import { assembleInlineLine, type InlineEscaping, type InlineSegment, type LineContainer, type NodeRange } from './line-escaping.ts'
 import { carriedInline } from '../opaque-carry.ts'
 import { claimsLine, holdsNullCharacter, isAutolink } from '../commonmark-grammar.ts'
-import { failure, success, type ConvertErrorPath, type Result } from '../../result.ts'
+import { failure, faulted, success, type ConvertErrorPath, type Result } from '../../result.ts'
 import { holdsEntityReference } from '../entity-references.ts'
 import { inlineDirective } from '../../adf/inline-directives.ts'
 import { largestNesting } from '../../nesting.ts'
 import { longestBacktickRun } from '../backtick-runs.ts'
 import { markSpelling, spellMarkAttributes } from '../mark-spellings.ts'
 import { sameMark } from '../../adf/editor-normal.ts'
+import { slotLineEndingFault, spellLeafDirective } from '../directive-syntax.ts'
 import { spellDestination, spellTitle } from '../link-syntax.ts'
 import { spellInlineNodeAttributes } from './inline-directive-spelling.ts'
-import { spellLeafDirective } from '../directive-syntax.ts'
 import { spellTextDirective } from '../text-directive.ts'
 
 type EmittedLine = { line: string; segments: InlineSegment[] }
@@ -207,7 +207,8 @@ function emitInlineDirective(node: AdfNode, directive: InlineDirective, index: n
   const slot = directive.textAttribute === undefined ? undefined : node.attrs?.[directive.textAttribute]
   if (slot === undefined) return success({ segments: [syntax(spellLeafDirective(node.type, attributes))] })
   if (typeof slot !== 'string') return success({ carry: { first: index, last: index } })
-  if (/[\n\r]/.test(slot)) return failure('unspellable-whitespace', `a ${node.type} content slot holds a newline no inline directive spans`, path)
+  const spans = slotLineEndingFault(node.type, slot)
+  if (spans !== undefined) return faulted(spans, path)
   if (holdsNullCharacter(slot)) return failure('unspellable-character', `a ${node.type} content slot holds a null character CommonMark replaces`, path)
   const content: InlineSegment[] = slot === '' ? [] : [{ escaping: 'bracketed', text: slot }]
   return success({ segments: [syntax(`:${node.type}[`), ...content, syntax(`]${attributes}`)] })