[gcalctool] Fix scary error message on startup

[Robin Sonefors <rsonefors src gnome org>]

commit 94bd301cd3a8fefa9c2b851bd2e95a9afb07be44
Author: Robin Sonefors <ozamosi flukkost nu>
Date:   Mon Oct 11 02:01:12 2010 +0200

    Fix scary error message on startup

 src/math-equation.c |   17 +++++++++++++----
 src/math-equation.h |    2 ++
 2 files changed, 15 insertions(+), 4 deletions(-)
---
diff --git a/src/math-equation.c b/src/math-equation.c
index 4481745..08f95e4 100644
--- a/src/math-equation.c
+++ b/src/math-equation.c
@@ -1223,6 +1223,18 @@ math_equation_get_property(GObject    *object,
     }
 }
 
+static void
+math_equation_constructed (GObject *object)
+{
+    GtkTextBuffer *parent_class;
+    parent_class = g_type_class_peek_parent(MATH_EQUATION_GET_CLASS(object));
+    if (G_OBJECT_CLASS(parent_class)->constructed)
+        G_OBJECT_CLASS(parent_class)->constructed(object);
+
+    MATH_EQUATION(object)->priv->ans_tag = gtk_text_buffer_create_tag(GTK_TEXT_BUFFER(object), NULL, "weight", PANGO_WEIGHT_BOLD, NULL);
+}
+
+
 
 static void
 math_equation_class_init (MathEquationClass *klass)
@@ -1245,6 +1257,7 @@ math_equation_class_init (MathEquationClass *klass)
 
     object_class->get_property = math_equation_get_property;
     object_class->set_property = math_equation_set_property;
+    object_class->constructed = math_equation_constructed;
 
     g_type_class_add_private (klass, sizeof (MathEquationPrivate));
   
@@ -1485,10 +1498,6 @@ math_equation_init(MathEquation *equation)
 
     equation->priv = G_TYPE_INSTANCE_GET_PRIVATE (equation, math_equation_get_type(), MathEquationPrivate);
 
-    // FIXME: Causes error
-    // (process:18573): Gtk-CRITICAL **: set_table: assertion buffer->tag_table == NULL' failed
-    equation->priv->ans_tag = gtk_text_buffer_create_tag(GTK_TEXT_BUFFER(equation), NULL, "weight", PANGO_WEIGHT_BOLD, NULL);
-
     g_signal_connect(equation, "insert-text", G_CALLBACK(pre_insert_text_cb), equation);
     g_signal_connect(equation, "delete-range", G_CALLBACK(pre_delete_range_cb), equation);  
     g_signal_connect_after(equation, "insert-text", G_CALLBACK(insert_text_cb), equation);
diff --git a/src/math-equation.h b/src/math-equation.h
index bd6d54c..fbba59c 100644
--- a/src/math-equation.h
+++ b/src/math-equation.h
@@ -28,7 +28,9 @@
 
 G_BEGIN_DECLS
 
+#define MATH_TYPE_EQUATION (math_equation_get_type ())
 #define MATH_EQUATION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), math_equation_get_type(), MathEquation))
+#define MATH_EQUATION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), MATH_TYPE_EQUATION, MathEquationClass))
 
 typedef struct MathEquationPrivate MathEquationPrivate;