[gnome-commander/gcmd-1-10] Fixed warning at runtime, added comment

[Uwe Scholz <uwescholz src gnome org>]

commit 97a045240adb74a5c5a2966832ae33c5c1ff462f
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Thu May 14 21:05:59 2020 +0200

    Fixed warning at runtime, added comment

 src/gnome-cmd-file-list.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/gnome-cmd-file-list.cc b/src/gnome-cmd-file-list.cc
index 09e07c2e..375782af 100644
--- a/src/gnome-cmd-file-list.cc
+++ b/src/gnome-cmd-file-list.cc
@@ -687,6 +687,7 @@ void GnomeCmdFileList::create_column_titles()
         gtk_widget_show (priv->column_labels[i]);
         gtk_box_pack_start (GTK_BOX (hbox), priv->column_labels[i], TRUE, TRUE, 0);
 
+        // ToDo: Replace GtkPixmap with GtkImage
         pixmap = gtk_pixmap_new (pm, bm);
         g_object_ref (pixmap);
         g_object_set_data_full (*this, "column-pixmap", pixmap, g_object_unref);
@@ -1492,7 +1493,7 @@ static gint on_button_release (GtkWidget *widget, GdkEventButton *event, GnomeCm
             return TRUE;
         }
         else
-            if (event->button == 3)
+            if (event->button == 3 && fl->priv->right_mb_timeout_id > 0)
                 g_source_remove (fl->priv->right_mb_timeout_id);
     }