[gnome-subtitles] Use a different method to calculate pixel width

[Pedro Daniel da Rocha Melo e Castro <pcastro src gnome org>]

commit f493343dd7779f1d6b1501807c9df46272a61026
Author: Pedro Castro <pedro gnomesubtitles org>
Date:   Sun Jul 17 14:46:42 2011 +0100

    Use a different method to calculate pixel width

 .../Ui/Edit/SubtitleEditTextViewMargin.cs          |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/GnomeSubtitles/Ui/Edit/SubtitleEditTextViewMargin.cs b/src/GnomeSubtitles/Ui/Edit/SubtitleEditTextViewMargin.cs
index 96f41ce..d93f72b 100644
--- a/src/GnomeSubtitles/Ui/Edit/SubtitleEditTextViewMargin.cs
+++ b/src/GnomeSubtitles/Ui/Edit/SubtitleEditTextViewMargin.cs
@@ -187,9 +187,9 @@ public class SubtitleEditTextViewMargin {
 		
 		/* Margin char width */
 		this.textLayout.SetText("0");
-		Pango.Rectangle layoutRect = GetPangoLayoutRect(this.textLayout);
-		this.marginCharWidth = layoutRect.Width;
-			
+		int marginCharHeight;
+		this.textLayout.GetPixelSize(out this.marginCharWidth, out marginCharHeight);
+
 		/* Events */
 		textView.ExposeEvent += OnExposeEvent;
 		textView.Buffer.Changed += OnBufferChanged; //To calculate margin digit count (based on the largest line char count)