Update libqmatrixclient && fix image provider crashes.

imports/Spectral/Component/Avatar.qml

@@ -14,7 +14,7 @@ Item {
 
         id: image
         visible: realSource
-        source: realSource
+        source: width < 1 ? "" : realSource
         sourceSize.width: width
         sourceSize.height: width
         fillMode: Image.PreserveAspectCrop

include/libqmatrixclient

@@ -1 +1 @@
-Subproject commit 23bf0e83aec1adaf81d9c50ce2385a98c20e3c93
+Subproject commit b467b0816f5f6816778f90b55a9d0b5437310fd5

src/imageprovider.cpp

@@ -6,10 +6,10 @@
 using QMatrixClient::BaseJob;
 
 ThumbnailResponse::ThumbnailResponse(QMatrixClient::Connection* c,
-    QString mediaId, const QSize& requestedSize)
+    QString id, const QSize& size)
   : c(c),
-    mediaId(std::move(mediaId)),
-    requestedSize(requestedSize),
+    mediaId(std::move(id)),
+    requestedSize(size),
     errorStr("Image request hasn't started") {
   if (requestedSize.isEmpty()) {
     errorStr.clear();
@@ -61,9 +61,10 @@ void ThumbnailResponse::prepareResult() {
 
 void ThumbnailResponse::doCancel() {
   // Runs in the main thread, not QML thread
-  Q_ASSERT(QThread::currentThread() == job->thread());
-  if (job)
+  if (job) {
+    Q_ASSERT(QThread::currentThread() == job->thread());
     job->abandon();
+  }
 }
 
 QQuickTextureFactory* ThumbnailResponse::textureFactory() const {
@@ -83,6 +84,6 @@ void ThumbnailResponse::cancel() {
 
 QQuickImageResponse* ImageProvider::requestImageResponse(
     const QString& id, const QSize& requestedSize) {
-  qDebug() << "ImageProvider: requesting " << id;
+  qDebug() << "ImageProvider: requesting " << id << "of size" << requestedSize;
   return new ThumbnailResponse(m_connection.load(), id, requestedSize);
 }