[gimp] pygimp: pyconsole: use appropriate Pango function to estimate char width

[Kristian Rietveld <kristian src gnome org>]

commit cd5dfb86429be05266f532ca24a4238697136347
Author: Kristian Rietveld <kris loopnest org>
Date:   Fri Apr 29 08:33:21 2016 +0200

    pygimp: pyconsole: use appropriate Pango function to estimate char width

 plug-ins/pygimp/plug-ins/pyconsole.py |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/plug-ins/pygimp/plug-ins/pyconsole.py b/plug-ins/pygimp/plug-ins/pyconsole.py
index 2f01c4a..3b71074 100644
--- a/plug-ins/pygimp/plug-ins/pyconsole.py
+++ b/plug-ins/pygimp/plug-ins/pyconsole.py
@@ -385,13 +385,17 @@ class _ReadLine(object):
         self.__delete(iter, end)
 
     def __get_width(self):
+        '''Estimate the number of characters that will fit in the area
+        currently allocated to this widget.'''
+
         if not (self.flags() & gtk.REALIZED):
             return 80
-        layout = pango.Layout(self.get_pango_context())
-        letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
-        layout.set_text(letters)
-        pix_width = layout.get_pixel_size()[0]
-        return self.allocation.width * len(letters) / pix_width
+
+        context = self.get_pango_context()
+        metrics = context.get_metrics(context.get_font_description(),
+                                      context.get_language())
+        pix_width = metrics.get_approximate_char_width()
+        return self.allocation.width * pango.SCALE / pix_width
 
     def __print_completions(self, completions):
         line_start = self.__get_text(self.__get_start(), self.__get_cursor())