Setup pixmap cache in a proper place

There is no need to reset the cache limit to previous value as
QPixmapCache is an application wide cache.
Also raise the cache size to 64MB.

src/app/application.cpp

@@ -33,6 +33,10 @@
 
 #include <algorithm>
 
+#ifdef DISABLE_GUI
+#include <cstdio>
+#endif
+
 #ifdef Q_OS_WIN
 #include <memory>
 #include <Windows.h>
@@ -47,6 +51,7 @@
 
 #ifndef DISABLE_GUI
 #include <QMessageBox>
+#include <QPixmapCache>
 #ifdef Q_OS_WIN
 #include <QSessionManager>
 #include <QSharedMemory>
@@ -54,14 +59,7 @@
 #ifdef Q_OS_MAC
 #include <QFileOpenEvent>
 #endif // Q_OS_MAC
-#include "addnewtorrentdialog.h"
+#endif
-#include "gui/uithememanager.h"
-#include "gui/utils.h"
-#include "mainwindow.h"
-#include "shutdownconfirmdialog.h"
-#else // DISABLE_GUI
-#include <cstdio>
-#endif // DISABLE_GUI
 
 #include "base/bittorrent/session.h"
 #include "base/bittorrent/torrenthandle.h"
@@ -85,6 +83,14 @@
 #include "applicationinstancemanager.h"
 #include "filelogger.h"
 
+#ifndef DISABLE_GUI
+#include "addnewtorrentdialog.h"
+#include "gui/uithememanager.h"
+#include "gui/utils.h"
+#include "mainwindow.h"
+#include "shutdownconfirmdialog.h"
+#endif // DISABLE_GUI
+
 #ifndef DISABLE_WEBUI
 #include "webui/webui.h"
 #endif
@@ -114,6 +120,8 @@ namespace
     const int MIN_FILELOG_SIZE = 1024; // 1KiB
     const int MAX_FILELOG_SIZE = 1000 * 1024 * 1024; // 1000MiB
     const int DEFAULT_FILELOG_SIZE = 65 * 1024; // 65KiB
+
+    const int PIXMAP_CACHE_SIZE = 64 * 1024 * 1024;  // 64MiB
 }
 
 Application::Application(const QString &id, int &argc, char **argv)
@@ -131,6 +139,7 @@ Application::Application(const QString &id, int &argc, char **argv)
     setDesktopFileName("org.qbittorrent.qBittorrent");
     setAttribute(Qt::AA_UseHighDpiPixmaps, true);  // opt-in to the high DPI pixmap support
     setQuitOnLastWindowClosed(false);
+    QPixmapCache::setCacheLimit(PIXMAP_CACHE_SIZE);
 #endif
 
     validateCommandLineParameters();

src/gui/torrentcontentmodel.cpp

@@ -77,24 +77,6 @@ namespace
     };
 
 #ifdef QBT_PIXMAP_CACHE_FOR_FILE_ICONS
-    struct Q_DECL_UNUSED PixmapCacheSetup
-    {
-        static const int PixmapCacheForIconsSize = 2 * 1024 * 1024; // 2 MiB for file icons
-
-        PixmapCacheSetup()
-        {
-            QPixmapCache::setCacheLimit(QPixmapCache::cacheLimit() + PixmapCacheForIconsSize);
-        }
-
-        ~PixmapCacheSetup()
-        {
-            Q_ASSERT(QPixmapCache::cacheLimit() > PixmapCacheForIconsSize);
-            QPixmapCache::setCacheLimit(QPixmapCache::cacheLimit() - PixmapCacheForIconsSize);
-        }
-    };
-
-    PixmapCacheSetup pixmapCacheSetup;
-
     class CachingFileIconProvider : public UnifiedFileIconProvider
     {
     public: