From dfedddf0bdb0d803cd8b2d32d74977228c9d58da Mon Sep 17 00:00:00 2001
From: Marius <froase@gmail.com>
Date: Tue, 20 Jun 2017 23:55:11 +0200
Subject: [PATCH] Wrap scroll button workaround in try/except

for older pyqt5 versions (5.2.1)
---
 qutebrowser/mainwindow/tabwidget.py | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/qutebrowser/mainwindow/tabwidget.py b/qutebrowser/mainwindow/tabwidget.py
index 9168a28b6..2096bf8e0 100644
--- a/qutebrowser/mainwindow/tabwidget.py
+++ b/qutebrowser/mainwindow/tabwidget.py
@@ -747,6 +747,8 @@ class TabBarStyle(QCommonStyle):
         Return:
             A QRect.
         """
+            
+            
         if sr == QStyle.SE_TabBarTabText:
             layouts = self._tab_layout(opt)
             if layouts is None:
@@ -759,13 +761,20 @@ class TabBarStyle(QCommonStyle):
             # style differences...
             rct = super().subElementRect(sr, opt, widget)
             return rct
-        elif sr == QStyle.SE_TabBarScrollLeftButton:
-            # We need this so the left scroll button is aligned properly.
-            # Otherwise, empty space will be shown after the last tab even
-            # though the button width is set to 0
-            rct = super().subElementRect(sr, opt, widget)
-            return rct
         else:
+            try:
+                # We need this so the left scroll button is aligned properly.
+                # Otherwise, empty space will be shown after the last tab even
+                # though the button width is set to 0
+                
+                # In older PyQt-versions (5.2.1) QStyle does not have this 
+                # attribute.
+                if sr == QStyle.SE_TabBarScrollLeftButton:
+                    return super().subElementRect(sr, opt, widget)
+
+            except AttributeError:
+                pass
+
             return self._style.subElementRect(sr, opt, widget)
 
     def _tab_layout(self, opt):