Only end the preamble at MakeTitle if directly inside DocumentEnvironment (#14593)

GitOrigin-RevId: 3252a8260e02728c05b753433e3488b799b18de0

services/web/frontend/js/features/source-editor/extensions/visual/atomic-decorations.ts

@@ -186,7 +186,14 @@ export const atomicDecorations = (options: Options) => {
     tree.iterate({
       enter(nodeRef) {
         if (nodeRef.node.type.is('Maketitle')) {
-          preamble.to = nodeRef.node.from
+          // end the preamble at \maketitle, if it's directly inside the document environment
+          const parentEnvironment = ancestorOfNodeWithType(
+            nodeRef.node,
+            '$Environment'
+          )
+          if (parentEnvironment?.type.is('DocumentEnvironment')) {
+            preamble.to = nodeRef.node.from
+          }
         } else if (nodeRef.node.type.is('DocumentEnvironment')) {
           // only count the first instance of DocumentEnvironment
           if (!seenDocumentEnvironment) {

services/web/test/frontend/features/source-editor/components/codemirror-editor-visual.spec.tsx

@@ -510,6 +510,25 @@ describe('<CodeMirrorEditor/> in Visual mode', function () {
     cy.get('.ol-cm-preamble-line').eq(3).should('not.exist')
   })
 
+  it('should exclude maketitle from preamble extents if nested in another environment', function () {
+    cy.get('@first-line').type(
+      [
+        '\\author{{}Author}',
+        '\\title{{}Document title}',
+        '\\begin{{}document}',
+        '\\begin{{}frame}{{}Foo}',
+        '\\maketitle',
+        '\\end{{}frame}',
+        '\\end{{}document}',
+        '',
+      ].join('{Enter}')
+    )
+    cy.get('.ol-cm-preamble-widget').should('have.length', 1)
+    cy.get('.ol-cm-preamble-widget').click()
+
+    cy.get('.ol-cm-preamble-line').should('have.length', 3)
+  })
+
   it('should show multiple authors', function () {
     cy.get('@first-line').type(
       [