From a1e24ab0a98ea6155c581907aca42532311218df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Tue, 24 Apr 2018 11:39:20 +0100
Subject: [PATCH] Resolves: tdf#116951 rhbz#1569331 start is G_MAXINT

and text is nullptr, seeing as an end G_MAXINT translates to str len,
assume the same for start

Change-Id: I76b8bb0e66694129d36bbe08a6d55fc434f3434f
---
 vcl/unx/gtk3/gtk3gtkframe.cxx | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/vcl/unx/gtk3/gtk3gtkframe.cxx b/vcl/unx/gtk3/gtk3gtkframe.cxx
index 113fcb425963..8a18974d2635 100644
--- a/vcl/unx/gtk3/gtk3gtkframe.cxx
+++ b/vcl/unx/gtk3/gtk3gtkframe.cxx
@@ -3977,8 +3977,14 @@ void GtkSalFrame::IMHandler::signalIMPreeditChanged( GtkIMContext*, gpointer im_
         ExtTextInputAttr sal_attr = ExtTextInputAttr::NONE;
 
         pango_attr_iterator_range (iter, &start, &end);
-        if (end == G_MAXINT)
-            end = pText ? g_utf8_strlen(pText, -1) : 0;
+        if (start == G_MAXINT || end == G_MAXINT)
+        {
+            auto len = pText ? g_utf8_strlen(pText, -1) : 0;
+            if (end == G_MAXINT)
+                end = len;
+            if (start == G_MAXINT)
+                start = len;
+        }
         if (end == start)
             continue;
 
-- 
2.14.3