fix(comments): allow ranges to be collapsed (#5892)

* fix(portable-text-editor): all paths must be checked

This optimization was a bit too optimistic.
It's causing issues with some type of selections.
Check every path here.

* fix(portable-text-editor): allow uncollapsed ranges

Uncollapsed ranges must be allowed as they may be pointing to empty blocks

* fix(comments): allow ranges to be collapsed

This is needed to support including empty blocks within the commented range

Author: skogsmaskin

packages/sanity/src/structure/comments/src/utils/inline-comments/buildRangeDecorationSelectionsFromComments.ts

@@ -137,31 +137,26 @@ export function buildRangeDecorationSelectionsFromComments(
             break
           }
         }
-        // If range is now collapsed, don't create a decoration
-        if (anchorOffset === focusOffset && childIndexFocus === childIndexAnchor) {
-          nullSelection = true
-        }
+
         decorators.push({
-          selection: nullSelection
-            ? null
-            : {
-                anchor: {
-                  path: [
-                    {_key: matchedBlock._key},
-                    'children',
-                    {_key: matchedBlock.children[childIndexAnchor]._key},
-                  ],
-                  offset: anchorOffset,
-                },
-                focus: {
-                  path: [
-                    {_key: matchedBlock._key},
-                    'children',
-                    {_key: matchedBlock.children[childIndexFocus]._key},
-                  ],
-                  offset: focusOffset,
-                },
-              },
+          selection: {
+            anchor: {
+              path: [
+                {_key: matchedBlock._key},
+                'children',
+                {_key: matchedBlock.children[childIndexAnchor]._key},
+              ],
+              offset: anchorOffset,
+            },
+            focus: {
+              path: [
+                {_key: matchedBlock._key},
+                'children',
+                {_key: matchedBlock.children[childIndexFocus]._key},
+              ],
+              offset: focusOffset,
+            },
+          },
           comment,
           range: {_key: matchedBlock._key, text: nullSelection ? '' : diffedText},
         })