Fixed a race condition for the libcurl cleanup which led to a memory leak.

es-app/src/guis/GuiScraperSearch.cpp

@@ -127,6 +127,22 @@ GuiScraperSearch::GuiScraperSearch(
 
 GuiScraperSearch::~GuiScraperSearch()
 {
+    // The following manual resets are required to avoid a race condition when the
+    // STOP button is pressed in the multi-scraper. Without this code there will be
+    // a memory leak as the cURL easy handle is not cleaned up. For a normally completed
+    // scraping however, the destructor will already have been called in HttpReq.
+    if (mSearchHandle)
+        mSearchHandle.reset();
+
+    if (mMDRetrieveURLsHandle)
+        mMDRetrieveURLsHandle.reset();
+
+    if (mMDResolveHandle)
+        mMDResolveHandle.reset();
+
+    if (mThumbnailReq)
+        mThumbnailReq.reset();
+
     HttpReq::cleanupCurlMulti();
 }