Import: Filter non-game Steam entries

Ignore Steam runtime/redistributable entries and other non-game content.

Also skip manifests that are not fully installed and ensure the install
folder exists before importing.

src/steamimporter.cpp

@@ -8,6 +8,7 @@
 #include <QFileInfo>
 #include <QRegularExpression>
 #include <QStandardPaths>
+#include <QStringList>
 #include <QTextStream>
 
 SteamImporter::SteamImporter(QObject *parent)
@@ -122,10 +123,54 @@ Game *SteamImporter::parseAppManifest(const QString &path)
         return nullptr;
     }
 
+    auto isNonGameEntry = [](const QString &title, const QString &dir) {
+        auto normalize = [](QString s) {
+            s = s.toLower();
+            s.remove(QLatin1Char(' '));
+            s.remove(QLatin1Char('_'));
+            s.remove(QLatin1Char('-'));
+            return s;
+        };
+
+        const QString t = normalize(title);
+        const QString d = normalize(dir);
+        static const QStringList patterns = {
+            QStringLiteral("steamlinuxruntime"),
+            QStringLiteral("steamworkscommonredistributables"),
+            QStringLiteral("steamworkssdkredist"),
+            QStringLiteral("shaderprecaching"),
+            QStringLiteral("proton"),
+            QStringLiteral("steamvr"),
+        };
+        for (const QString &p : patterns) {
+            if (t.contains(p) || d.contains(p)) {
+                return true;
+            }
+        }
+        return false;
+    };
+
+    if (isNonGameEntry(name, installDir)) {
+        return nullptr;
+    }
+
     // Skip tools and other non-game content
     QString stateFlags = getValue(QStringLiteral("StateFlags"));
-    if (stateFlags == QLatin1String("2")) {
-        // Only partially installed
+    if (!stateFlags.isEmpty()) {
+        bool ok = false;
+        const int flags = stateFlags.toInt(&ok);
+        if (ok) {
+            constexpr int InstalledFlag = 4;
+            if ((flags & InstalledFlag) == 0) {
+                return nullptr;
+            }
+        }
+    }
+
+    QFileInfo manifestInfo(path);
+    const QString gameDir = manifestInfo.absolutePath() + QStringLiteral("/common/") + installDir;
+    if (!QDir(gameDir).exists()) {
+        return nullptr;
     }
 
     Game *game = new Game(QStringLiteral("steam-%1").arg(appId), name);
@@ -140,8 +185,6 @@ Game *SteamImporter::parseAppManifest(const QString &path)
     }
 
     // Set installation directory
-    QFileInfo manifestInfo(path);
-    QString gameDir = manifestInfo.absolutePath() + QStringLiteral("/common/") + installDir;
     game->setWorkingDirectory(gameDir);
 
     game->setInstalled(true);