From 12caf3e8eddfc4f8ca4a33a32136e83ee3c4e7f0 Mon Sep 17 00:00:00 2001
From: Michael Doppler <m.doppler@synedra.com>
Date: Thu, 8 Nov 2018 15:06:07 +0100
Subject: [PATCH] [PATCH] Improve font database performance by limiting font
 fallbacks to 10 entries.

---
 qtbase/src/gui/text/qfontdatabase.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/qtbase/src/gui/text/qfontdatabase.cpp b/qtbase/src/gui/text/qfontdatabase.cpp
index e8b91ca..df98dbc 100644
--- a/qtbase/src/gui/text/qfontdatabase.cpp
+++ b/qtbase/src/gui/text/qfontdatabase.cpp
@@ -819,7 +819,8 @@ QStringList QPlatformFontDatabase::fallbacksForFamily(const QString &family, QFo
         writingSystem = QFontDatabase::Any;
 
     QFontDatabasePrivate *db = privateDb();
-    for (int i = 0; i < db->count; ++i) {
+    const int maxFallBacks = 10;
+    for (int i = 0; i < db->count && preferredFallbacks.count() < maxFallBacks; ++i) {
         QtFontFamily *f = db->families[i];
 
         f->ensurePopulated();
-- 
2.19.1.windows.1