Use stable sort when cleaning batches.

Ensure valid batches do not change order. This was causing rendering
issues when m_rebuild was 0, as we would not re-sort the list in correct
render order after cleanup.

Change-Id: I912fb313d4029f96e263fad24d68462f252003df
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp b/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
index 1f692c29d4..4b15b04b36 100644
--- a/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
+++ b/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
@@ -1445,7 +1445,7 @@ void Renderer::invalidateBatchAndOverlappingRenderOrders(Batch *batch)
  */
 void Renderer::cleanupBatches(QDataBuffer<Batch *> *batches) {
     if (batches->size()) {
-        std::sort(&batches->first(), &batches->last() + 1, qsg_sort_batch_is_valid);
+        std::stable_sort(&batches->first(), &batches->last() + 1, qsg_sort_batch_is_valid);
         int count = 0;
         while (count < batches->size() && batches->at(count)->first)
             ++count;