[visual] Place cursor in editable content when closing the preamble (#14162)

GitOrigin-RevId: 35f146caa4469c7f31fb00dc6047a421b1daadb0

services/web/frontend/js/features/source-editor/utils/tree-operations/environments.ts

@@ -1,6 +1,6 @@
 import { ensureSyntaxTree } from '@codemirror/language'
 import { EditorState } from '@codemirror/state'
-import { SyntaxNode, SyntaxNodeRef, Tree } from '@lezer/common'
+import { SyntaxNode, SyntaxNodeRef } from '@lezer/common'
 import { previousSiblingIs } from './common'
 import { NodeIntersectsChangeFn, ProjectionItem } from './projection'
 import { FigureData } from '../../extensions/figure-modal'
@@ -138,72 +138,6 @@ export const cursorIsAtEndEnvironment = (
     }
   }
 }
-
-const findStartOfDocumentEnvironment = (tree: Tree): number | null => {
-  const docEnvironment = findNodeInDocument(tree, 'DocumentEnvironment')
-  return docEnvironment?.getChild('Content')?.from || null
-}
-
-const findStartOfAbstractEnvironment = (
-  tree: Tree,
-  state: EditorState
-): number | null => {
-  const abstractEnvironment = findNodeInDocument(
-    tree,
-    (nodeRef: SyntaxNodeRef) => {
-      return Boolean(
-        nodeRef.type.is('$Environment') &&
-          getEnvironmentName(nodeRef.node, state) === 'abstract'
-      )
-    }
-  )
-  return abstractEnvironment?.getChild('Content')?.from || null
-}
-
-const findMaketitleCommand = (tree: Tree): number | null => {
-  const maketitle = findNodeInDocument(tree, 'Maketitle')
-  return maketitle?.to ?? null
-}
-
-const findNodeInDocument = (
-  tree: Tree,
-  predicate: number | string | ((node: SyntaxNodeRef) => boolean)
-): SyntaxNode | null => {
-  let node: SyntaxNode | null = null
-  const predicateFn =
-    typeof predicate !== 'function'
-      ? (nodeRef: SyntaxNodeRef) => {
-          return nodeRef.type.is(predicate)
-        }
-      : predicate
-  tree?.iterate({
-    enter(nodeRef) {
-      if (node !== null) {
-        return false
-      }
-      if (predicateFn(nodeRef)) {
-        node = nodeRef.node
-        return false
-      }
-    },
-  })
-  return node
-}
-
-export const findStartOfDocumentContent = (
-  state: EditorState
-): number | null => {
-  const tree = ensureSyntaxTree(state, state.doc.length, HUNDRED_MS)
-  if (!tree) {
-    return null
-  }
-  return (
-    findStartOfAbstractEnvironment(tree, state) ??
-    findMaketitleCommand(tree) ??
-    findStartOfDocumentEnvironment(tree)
-  )
-}
-
 /**
  *
  * @param node A node of type `$Environment`, `BeginEnv`, or `EndEnv`