Update to latest backup integration tests

Co-authored-by: trevor-signal <131492920+trevor-signal@users.noreply.github.com>

.github/workflows/ci.yml

@@ -194,7 +194,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         repository: 'signalapp/Signal-Message-Backup-Tests'
-        ref: '22d7f507b61691e0a7da1fd4b233f219bdaf2280'
+        ref: '93a7d29527cb33e6bf23bc56fbf74d62cf682001'
         path: 'backup-integration-tests'
 
     - run: xvfb-run --auto-servernum npm run test-electron

protos/Backups.proto

@@ -729,8 +729,10 @@ message BodyRange {
     MONOSPACE = 5;
   }
 
-  optional uint32 start = 1;
-  optional uint32 length = 2;
+  // 'start' and 'length' are measured in UTF-16 code units.
+  // They may refer to offsets in a longText attachment.
+  uint32 start = 1;
+  uint32 length = 2;
 
   oneof associatedValue {
     bytes mentionAci = 3;

protos/SignalService.proto

@@ -310,9 +310,9 @@ message DataMessage {
       STRIKETHROUGH = 4;
       MONOSPACE = 5;
     }
-
-    optional uint32 start = 1;
-    optional uint32 length = 2;
+    
+    optional uint32 start = 1;   // Starting index in UTF-16 code units/raw string representation
+    optional uint32 length = 2;  // Length of range in UTF-16 code units/raw string representation
 
     oneof associatedValue {
       string mentionAci = 3;

ts/types/BodyRange.ts

@@ -171,11 +171,9 @@ export function filterAndClean(
 
   return ranges
     .map(range => {
-      const { start, length, ...restOfRange } = range;
-      if (!isNumber(start)) {
-        log.warn('filterAndClean: Dropping bodyRange with non-number start');
-        return undefined;
-      }
+      const { start: startFromRange, length, ...restOfRange } = range;
+
+      const start = startFromRange ?? 0;
       if (!isNumber(length)) {
         log.warn('filterAndClean: Dropping bodyRange with non-number length');
         return undefined;