core/intercept: do not intercept non qml files

Avoids forcing Images to lazy load which causes unexpected flashes.

src/core/generation.cpp

@@ -27,6 +27,7 @@ EngineGeneration::EngineGeneration(QmlScanner scanner)
     , interceptNetFactory(this->scanner.qmldirIntercepts) {
 	g_generations.insert(&this->engine, this);
 
+	this->engine.addUrlInterceptor(&this->urlInterceptor);
 	this->engine.setNetworkAccessManagerFactory(&this->interceptNetFactory);
 	this->engine.setIncubationController(&this->delayedIncubationController);
 }

src/core/generation.hpp

@@ -29,6 +29,7 @@ public:
 	static EngineGeneration* findObjectGeneration(QObject* object);
 
 	QmlScanner scanner;
+	QsUrlInterceptor urlInterceptor;
 	QsInterceptNetworkAccessManagerFactory interceptNetFactory;
 	QQmlEngine engine;
 	ShellRoot* root = nullptr;

src/core/qsintercept.cpp

@@ -9,11 +9,26 @@
 #include <qnetworkaccessmanager.h>
 #include <qnetworkrequest.h>
 #include <qobject.h>
+#include <qqmlabstracturlinterceptor.h>
 #include <qstring.h>
 #include <qtypes.h>
+#include <qurl.h>
 
 Q_LOGGING_CATEGORY(logQsIntercept, "quickshell.interceptor", QtWarningMsg);
 
+QUrl QsUrlInterceptor::intercept(const QUrl& url, QQmlAbstractUrlInterceptor::DataType type) {
+	// Some types such as Image take into account where they are loading from, and force
+	// asynchronous loading over a network. qsintercept is considered to be over a network.
+	if (type == QQmlAbstractUrlInterceptor::DataType::UrlString && url.scheme() == "qsintercept") {
+		auto newUrl = url;
+		newUrl.setScheme("file");
+		qCDebug(logQsIntercept) << "Rewrote intercept" << url << "to" << newUrl;
+		return newUrl;
+	}
+
+	return url;
+}
+
 QsInterceptDataReply::QsInterceptDataReply(const QString& qmldir, QObject* parent)
     : QNetworkReply(parent)
     , content(qmldir.toUtf8()) {

src/core/qsintercept.hpp

@@ -5,11 +5,17 @@
 #include <qnetworkaccessmanager.h>
 #include <qnetworkreply.h>
 #include <qnetworkrequest.h>
+#include <qqmlabstracturlinterceptor.h>
 #include <qqmlnetworkaccessmanagerfactory.h>
 #include <qurl.h>
 
 Q_DECLARE_LOGGING_CATEGORY(logQsIntercept);
 
+class QsUrlInterceptor: public QQmlAbstractUrlInterceptor {
+public:
+	QUrl intercept(const QUrl& url, QQmlAbstractUrlInterceptor::DataType type) override;
+};
+
 class QsInterceptDataReply: public QNetworkReply {
 	Q_OBJECT;