Avoid mutual ownership in qstdweb's File::stream

The mutual ownership of chunkCompleted<->fileReader caused both not
to be freed, which resulted in a memory leak. Resolve this by
introducing the ChunkedFileReader class which owns itself until file
read is finished.

Also, resolve a similar issue in qwasmlocalfileaccess.

Fixes: QTBUG-109436
Pick-to: 6.5
Change-Id: Ieec4cde15a893fa6a2e21a62d3bb6637374c5364
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/platform/wasm/qwasmlocalfileaccess.cpp b/src/gui/platform/wasm/qwasmlocalfileaccess.cpp
index 1b797be9fe..47deb0d553 100644
--- a/src/gui/platform/wasm/qwasmlocalfileaccess.cpp
+++ b/src/gui/platform/wasm/qwasmlocalfileaccess.cpp
@@ -124,7 +124,7 @@ void readFiles(const qstdweb::FileList &fileList,
         }
 
         // Read file data into caller-provided buffer
-        file.stream(buffer, [=]() {
+        file.stream(buffer, [readFile = readFile.get(), fileIndex, fileDataReady]() {
             fileDataReady();
             (*readFile)(fileIndex + 1);
         });