No tabs when not versions; better first version message (#5627)

Author: myovchev

packages/apostrophe/modules/@apostrophecms/document-versions/ui/apos/components/AposDocVersions.vue

@@ -480,8 +480,6 @@ onMounted(async () => {
   }
   if (versions.value.length) {
     selectVersion(versions.value[0]);
-  } else {
-    evaluateConditions(props.doc);
   }
 });
 

packages/apostrophe/modules/@apostrophecms/document-versions/ui/apos/components/AposDocVersionsChanges.vue

@@ -299,16 +299,16 @@ function matches(row) {
   return changeGroups.matchesFilter(row, filter.value);
 }
 
-// What an empty list says: a restore and a first version are baselines,
-// while a version compared with the one before it and left with nothing
-// ended where that one did
+// What an empty list says: a restore is a baseline, a first version has
+// nothing before it, and a version compared with the one before it and left
+// with nothing ended where that one did
 const emptyMessage = computed(() => {
   if (props.version?.restoredFrom) {
     return 'apostrophe:versionRestoredBaseline';
   }
   return props.compared
     ? 'apostrophe:versionUnchanged'
-    : 'apostrophe:versionNoChanges';
+    : 'apostrophe:versionFirst';
 });
 
 const shownRows = computed(() => props.rows.filter(matches));

packages/apostrophe/modules/@apostrophecms/document-versions/ui/apos/composables/useDocVersionTabs.js

@@ -12,7 +12,7 @@ import {
  * The tabs of the versions modal: the read-only schema of the document's
  * type, grouped as the document editor groups it, with the conditional
  * fields evaluated against the version shown. A tab none of whose fields
- * renders is not visible.
+ * renders is not visible, and there are no tabs until a version is shown.
  *
  * @param {object} options
  * @param {import('vue').Ref<object>} options.moduleOptions
@@ -22,7 +22,7 @@ import {
  * @param {object} options.doc
  *   The document the modal opened for
  * @param {import('vue').Ref<{ data: object }>} options.docFields
- *   The version shown
+ *   The version shown, `data` empty until one is
  */
 export function useDocVersionTabs({
   moduleOptions, unsupported, doc, docFields
@@ -51,11 +51,10 @@ export function useDocVersionTabs({
     );
   }
 
-  // With no version to show, the tabs follow the live document
-  function evaluateConditions(data = docFields.value.data) {
+  function evaluateConditions() {
     conditionalFields.value = getConditionalFields(
       schema.value,
-      data,
+      docFields.value.data,
       externalConditionsResults.value
     );
   }
@@ -93,7 +92,7 @@ export function useDocVersionTabs({
   }
 
   const versionTabs = computed(() => {
-    if (unsupported.value) {
+    if (unsupported.value || !docFields.value.data.type) {
       return [];
     }
     const tabs = Object.entries(groups.value)

packages/apostrophe/modules/@apostrophecms/i18n/i18n/en.json

@@ -796,6 +796,7 @@
   "versionFailDocPermsMessage": "Insufficient permissions.",
   "versionFailVersionLoadMessage": "Failed to load the requested Document Version.",
   "versionFailVersionRestoreMessage": "Unable to restore the requested Document Version.",
+  "versionFirst": "This is the first recorded version. There is no earlier version to compare it with.",
   "versionFilterChanges": "Filter changes",
   "versionFilterShowing": "Filter changes, showing {{ count }} edit",
   "versionFilterShowing_plural": "Filter changes, showing {{ count }} edits",
@@ -826,7 +827,6 @@
   "versionNavPosition": "{{ current }} of {{ total }}",
   "versionNavPrevious": "Previous",
   "versionNavShow": "Show in the document",
-  "versionNoChanges": "No changes recorded for this version.",
   "versionNoChangesMatch": "No changes match these filters.",
   "versionOpensNewTab": "Opens in a new tab",
   "versionOrderChanged": "Order changed",