fix: warnings when compiling with Qt 6.10 (#6422)

src/common/Credentials.cpp

@@ -65,14 +65,21 @@ QString insecurePath()
 QJsonDocument loadInsecure()
 {
     QFile file(insecurePath());
-    file.open(QIODevice::ReadOnly);
+    if (!file.open(QIODevice::ReadOnly))
+    {
+        return {};
+    }
+
     return QJsonDocument::fromJson(file.readAll());
 }
 
 void storeInsecure(const QJsonDocument &doc)
 {
     QSaveFile file(insecurePath());
-    file.open(QIODevice::WriteOnly);
+    if (!file.open(QIODevice::WriteOnly))
+    {
+        return;
+    }
     file.write(doc.toJson());
     file.commit();
 }

src/common/LinkParser.cpp

@@ -1,6 +1,7 @@
 #define QT_NO_CAST_FROM_ASCII  // avoids unexpected implicit casts
 #include "common/LinkParser.hpp"
 
+#include "common/QLogging.hpp"
 #include "util/QCompareTransparent.hpp"
 
 #include <QFile>
@@ -20,7 +21,12 @@ TldSet &tlds()
 {
     static TldSet tlds = [] {
         QFile file(QStringLiteral(":/tlds.txt"));
-        file.open(QFile::ReadOnly);
+        bool ok = file.open(QFile::ReadOnly);
+        if (!ok)
+        {
+            assert(false && "Resources not available");
+            qCWarning(chatterinoApp) << "Resources not available";
+        }
         QTextStream stream(&file);
 
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)

src/common/Modes.cpp

@@ -9,7 +9,10 @@ namespace chatterino {
 Modes::Modes()
 {
     QFile file(combinePath(QCoreApplication::applicationDirPath(), "modes"));
-    file.open(QIODevice::ReadOnly);
+    if (!file.open(QIODevice::ReadOnly))
+    {
+        return;
+    }
 
     while (!file.atEnd())
     {

src/common/WindowDescriptors.cpp

@@ -14,7 +14,10 @@ namespace {
 QJsonArray loadWindowArray(const QString &settingsPath)
 {
     QFile file(settingsPath);
-    file.open(QIODevice::ReadOnly);
+    if (!file.open(QIODevice::ReadOnly))
+    {
+        return {};
+    }
     QByteArray data = file.readAll();
     QJsonDocument document = QJsonDocument::fromJson(data);
     QJsonArray windows_arr = document.object().value("windows").toArray();