From bcf11cf1e8945deff216237237b3d3d71e0d67b7 Mon Sep 17 00:00:00 2001
From: jagannatharjun <jagannatharjun11@gmail.com>
Date: Sat, 23 May 2020 10:47:30 +0530
Subject: [PATCH] Cache flag icons

---
 src/gui/uithememanager.cpp | 10 +++++++++-
 src/gui/uithememanager.h   |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/gui/uithememanager.cpp b/src/gui/uithememanager.cpp
index 3343cfaa5..a48656744 100644
--- a/src/gui/uithememanager.cpp
+++ b/src/gui/uithememanager.cpp
@@ -140,7 +140,15 @@ QIcon UIThemeManager::getIcon(const QString &iconId, const QString &fallback) co
 QIcon UIThemeManager::getFlagIcon(const QString &countryIsoCode) const
 {
     if (countryIsoCode.isEmpty()) return {};
-    return QIcon(":/icons/flags/" + countryIsoCode.toLower() + ".svg");
+
+    const QString key = countryIsoCode.toLower();
+    const auto iter = m_flagCache.find(key);
+    if (iter != m_flagCache.end())
+        return *iter;
+
+    const QIcon icon {QLatin1String(":/icons/flags/") + key + QLatin1String(".svg")};
+    m_flagCache[key] = icon;
+    return icon;
 }
 
 QColor UIThemeManager::getColor(const QString &id, const QColor &defaultColor) const
diff --git a/src/gui/uithememanager.h b/src/gui/uithememanager.h
index dca86193b..e2580b78b 100644
--- a/src/gui/uithememanager.h
+++ b/src/gui/uithememanager.h
@@ -62,6 +62,7 @@ private:
     static UIThemeManager *m_instance;
     QHash<QString, QColor> m_colors;
     mutable QHash<QString, QIcon> m_iconCache;
+    mutable QHash<QString, QIcon> m_flagCache;
     const bool m_useCustomTheme;
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
     const bool m_useSystemTheme;