core: reference scanned paths by QDir over QString

Fixes a bug introduced in 3e2ce40 where a directory imported with a
"../name" path import would be passed to scanDir as ending in '/' which
created an invalid duplicate scan entry.

src/core/scan.cpp

@@ -19,12 +19,13 @@
 
 QS_LOGGING_CATEGORY(logQmlScanner, "quickshell.qmlscanner", QtWarningMsg);
 
-void QmlScanner::scanDir(const QString& path) {
-	if (this->scannedDirs.contains(path)) return;
-	this->scannedDirs.push_back(path);
+void QmlScanner::scanDir(const QDir& dir) {
+	if (this->scannedDirs.contains(dir)) return;
+	this->scannedDirs.push_back(dir);
+
+	const auto& path = dir.path();
 
 	qCDebug(logQmlScanner) << "Scanning directory" << path;
-	auto dir = QDir(path);
 
 	struct Entry {
 		QString name;
@@ -166,7 +167,7 @@ bool QmlScanner::scanQmlFile(const QString& path, bool& singleton, bool& interna
 	auto currentdir = QDir(QFileInfo(path).absolutePath());
 
 	// the root can never be a singleton so it dosent matter if we skip it
-	this->scanDir(currentdir.path());
+	this->scanDir(currentdir);
 
 	for (auto& import: imports) {
 		QString ipath;

src/core/scan.hpp

@@ -16,10 +16,10 @@ public:
 	QmlScanner() = default;
 	QmlScanner(const QDir& rootPath): rootPath(rootPath) {}
 
-	void scanDir(const QString& path);
+	void scanDir(const QDir& dir);
 	void scanQmlRoot(const QString& path);
 
-	QVector<QString> scannedDirs;
+	QVector<QDir> scannedDirs;
 	QVector<QString> scannedFiles;
 	QHash<QString, QString> fileIntercepts;