Only use the LaTeX indent service for when inserting a line break (#21530)

GitOrigin-RevId: 15c5e5afdee59badc833fe2deb13a80b3c409862

services/web/frontend/js/features/source-editor/extensions/visual/utils/list-item.ts

@@ -1,13 +1,9 @@
 import { EditorState } from '@codemirror/state'
-import {
-  getIndentation,
-  IndentContext,
-  indentString,
-} from '@codemirror/language'
+import { IndentContext, indentString } from '@codemirror/language'
 
 export const createListItem = (state: EditorState, pos: number) => {
   const cx = new IndentContext(state)
-  const columns = getIndentation(cx, pos) ?? 0
+  const columns = cx.lineIndent(pos)
   const indent = indentString(state, columns)
   return `${indent}\\item `
 }