Fixed discussion offset restore on undo

src/services/diffUtils.js

@@ -64,12 +64,6 @@ function stripDiscussionOffsets(objectMap) {
 }
 
 function restoreDiscussionOffsets(content, markerKeys) {
-  // Init offsets (just in case)
-  Object.keys(content.discussions).forEach((discussionId) => {
-    const discussion = content.discussions[discussionId];
-    discussion.start = 0;
-    discussion.end = 0;
-  });
   // Go through markers
   let count = 0;
   const maxIdx = markerKeys.length;
@@ -86,6 +80,15 @@ function restoreDiscussionOffsets(content, markerKeys) {
     count += 1;
     return '';
   });
+  Object.keys(content.discussions).forEach((discussionId) => {
+    const discussion = content.discussions[discussionId];
+    if (discussion.start === undefined) {
+      discussion.start = discussion.end || 0;
+    }
+    if (discussion.end === undefined) {
+      discussion.end = discussion.start;
+    }
+  });
 }
 
 function mergeText(serverText, clientText, lastMergedText) {

src/services/editorSvcDiscussions.js

@@ -129,6 +129,7 @@ export default {
         currentPatchableText = diffUtils.makePatchableText(newContent, markerKeys, markerIdxMap);
       } else {
         // Take a chance to restore discussion offsets on undo/redo
+        newContent.text = currentPatchableText;
         diffUtils.restoreDiscussionOffsets(newContent, markerKeys);
         syncDiscussionMarkers(newContent, false);
       }

src/services/optional/scrollSync.js

@@ -4,7 +4,6 @@ import editorSvc from '../editorSvc';
 
 let editorScrollerElt;
 let previewScrollerElt;
-let previewElt;
 let editorFinishTimeoutId;
 let previewFinishTimeoutId;
 let skipAnimation;
@@ -122,7 +121,6 @@ store.watch(() => store.getters['data/localSettings'].scrollSync, forceScrollSyn
 editorSvc.$on('inited', () => {
   editorScrollerElt = editorSvc.editorElt.parentNode;
   previewScrollerElt = editorSvc.previewElt.parentNode;
-  previewElt = editorSvc.previewElt;
 
   editorScrollerElt.addEventListener('scroll', () => {
     if (isEditorMoving) {
@@ -149,14 +147,7 @@ editorSvc.$on('sectionList', () => {
   sectionDescList = undefined;
 });
 
-editorSvc.$on('conversionCtx', () => {
-  // Set the preview height to prevent scrollbar from jumping
-  previewElt.style.height = `${previewElt.offsetHeight}px`;
-});
-
 editorSvc.$on('previewText', () => {
-  // Remove height property once the preview as been refreshed
-  previewElt.style.removeProperty('height');
   // Assume the user is writing in the editor
   isScrollEditor = store.getters['layout/styles'].showEditor;
   // A preview scrolling event can occur if height is smaller