From 1363ab2f8f0bc56e8303f2a1673644404c41ef03 Mon Sep 17 00:00:00 2001
From: dos-reis <gdr@axiomatics.org>
Date: Sun, 23 Jun 2013 19:00:30 +0000
Subject: Fix font units.  On Mac OS X, QT may return 0 for certain font
 metrics components.

---
 src/gui/conversation.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src/gui/conversation.cc')

diff --git a/src/gui/conversation.cc b/src/gui/conversation.cc
index 64308665..6a1ecb18 100644
--- a/src/gui/conversation.cc
+++ b/src/gui/conversation.cc
@@ -1,5 +1,6 @@
-// Copyright (C) 2011, Gabriel Dos Reis.
+// Copyright (C) 2011-2013, Gabriel Dos Reis.
 // All rights reserved.
+// Written by Gabriel Dos Reis.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -44,7 +45,10 @@ namespace OpenAxiom {
    // associated with `w'.
    static QSize font_units(const QWidget* w) {
       const QFontMetrics fm = w->fontMetrics();
-      return QSize(fm.maxWidth(), fm.lineSpacing());
+      const auto h = fm.lineSpacing();
+      if (auto w = fm.maxWidth())
+         return { w, h };
+      return { fm.width('W'), h };
    }
 
    // Return true if the QString `s' is morally an empty string.
-- 
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