Stop Gtk Warning Negative content width

This is caused by the spacer column being reduced as new columns are
inserted before the menu selection column at the end. When it gets to
a size that can not hold a valid button in the header you get the
warning so remove the spacer column.

gnucash/gnome-utils/gnc-tree-view.c

@@ -106,8 +106,6 @@ static gchar **gnc_tree_view_get_column_order (GncTreeView *view,
 
 typedef struct GncTreeViewPrivate
 {
-    /*  Spacer column */
-    GtkTreeViewColumn *spacer_column;
     GtkTreeViewColumn *selection_column;
 
     /* Column selection menu related values */
@@ -238,19 +236,6 @@ gnc_tree_view_init (GncTreeView *view, void *data)
     gtk_tree_view_set_column_drag_function(GTK_TREE_VIEW(view),
                                            gnc_tree_view_drop_ok_cb, NULL, NULL);
 
-    /* Create the next to last column which is always present, visible,
-     * and empty. Override the defaults and make this a one pixel wide
-     * column, but have it take up any extra space in the window. */
-    column = gnc_tree_view_add_text_column (view, NULL, NULL, NULL, NULL,
-                                            -1, -1, NULL);
-    g_object_set(G_OBJECT(column),
-                 "fixed-width", 1,
-                 "expand", TRUE,
-                 (gchar *)NULL);
-    priv->spacer_column = column;
-
-    gtk_tree_view_column_set_sizing (column, GTK_TREE_VIEW_COLUMN_FIXED);
-
     // Set grid lines option to preference
     gtk_tree_view_set_grid_lines (GTK_TREE_VIEW(view), gnc_tree_view_get_grid_lines_pref ());
     gnc_prefs_register_cb (GNC_PREFS_GROUP_GENERAL, GNC_PREF_GRID_LINES_HORIZONTAL,
@@ -273,7 +258,7 @@ gnc_tree_view_init (GncTreeView *view, void *data)
     g_object_set(G_OBJECT(column),
                  "clickable", TRUE,
                  "widget", icon,
-                 "fixed-width", requisition.width + 10,
+                 "alignment", 1.0,
                  (gchar *)NULL);
     priv->selection_column = column;
     g_signal_connect(G_OBJECT(column), "clicked",
@@ -1407,8 +1392,6 @@ void gnc_tree_view_expand_columns (GncTreeView *view,
     }
     va_end (args);
 
-    gtk_tree_view_column_set_visible (priv->spacer_column, !hide_spacer);
-
     LEAVE(" ");
 }
 
@@ -1449,7 +1432,6 @@ gnc_tree_view_set_control_column_background (GncTreeView *view, gint column, Gtk
     ENTER("view %p, column %d, func %p", view, column, func);
     priv = GNC_TREE_VIEW_GET_PRIVATE (view);
 
-    update_control_cell_renderers_background (view, priv->spacer_column, column, func);
     update_control_cell_renderers_background (view, priv->selection_column, column, func);
 
     LEAVE(" ");
@@ -1562,7 +1544,6 @@ gnc_tree_view_configure_columns (GncTreeView *view)
     hide_spacer = (gnc_tree_view_count_visible_columns(view) == 1);
     column = gtk_tree_view_get_column(GTK_TREE_VIEW(view), 0);
     gtk_tree_view_column_set_expand(column, hide_spacer);
-    gtk_tree_view_column_set_visible(priv->spacer_column, !hide_spacer);
     gtk_tree_view_column_set_visible(priv->selection_column, !hide_spacer);
 
     LEAVE(" ");
@@ -2066,9 +2047,9 @@ gnc_tree_view_append_column (GncTreeView *view,
     n = g_list_length(columns);
     g_list_free(columns);
 
-    /* Ignore the initial two columns (the spacer and the selection menu) */
+    /* Ignore the initial column, the selection menu */
-    if (n >= 2)
+    if (n >= 1)
-        n -= 2;
+        n -= 1;
     return gtk_tree_view_insert_column (GTK_TREE_VIEW(view), column, n);
 }