lottie/slot: Support overriding plural sids

Previously, slot overriding only works in single sid, the others are ignored.

This patch enables slot overriding for all sids within a single slot.

src/loaders/lottie/tvgLottieLoader.cpp

@@ -305,21 +305,22 @@ bool LottieLoader::override(const char* slot)
 
     //parsing slot json
     LottieParser parser(temp, dirName);
-    auto sid = parser.sid();
-    if (!sid) {
-        free(temp);
-        return false;
-    }
 
-    bool ret = false;
+    auto idx = 0;
+    auto success = true;
+    while (auto sid = parser.sid(idx == 0)) {
         for (auto s = comp->slots.begin(); s < comp->slots.end(); ++s) {
             if (strcmp((*s)->sid, sid)) continue;
-        ret = parser.parse(*s);
+            if (!parser.parse(*s)) success = false;
             break;
         }
+        ++idx;
+    }
+
+    if (idx < 1) success = false;
 
     free(temp);
-    return ret;
+    return success;
 }
 
 

src/loaders/lottie/tvgLottieParser.cpp

@@ -1238,11 +1238,13 @@ void LottieParser::postProcess(Array<LottieGlyph*>& glyphes)
 /* External Class Implementation                                        */
 /************************************************************************/
 
-const char* LottieParser::sid()
+const char* LottieParser::sid(bool first)
 {
+    if (first) {
         //verify json
         if (!parseNext()) return nullptr;
         enterObject();
+    }
     return nextObjectKey();
 }
 

src/loaders/lottie/tvgLottieParser.h

@@ -37,7 +37,7 @@ public:
 
     bool parse();
     bool parse(LottieSlot* slot);
-    const char* sid();
+    const char* sid(bool first = false);
 
     LottieComposition* comp = nullptr;
     const char* dirName = nullptr;       //base resource directory