From 9321f31d0ad745864b551bd530789a370ca322ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Sat, 23 Dec 2017 11:43:09 +0200
Subject: [PATCH] Don't require a mutable self for TagSetterExtManual::add()

Like all GObjects, mutation works through interior mutability.
---
 gstreamer/src/tag_setter.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gstreamer/src/tag_setter.rs b/gstreamer/src/tag_setter.rs
index 4c7ffa5b4..8eaeeed6c 100644
--- a/gstreamer/src/tag_setter.rs
+++ b/gstreamer/src/tag_setter.rs
@@ -15,13 +15,13 @@ use glib::value::ToSendValue;
 use tags::*;
 
 pub trait TagSetterExtManual {
-    fn add<'a, T: Tag<'a>>(&mut self, value: T::TagType, mode: TagMergeMode)
+    fn add<'a, T: Tag<'a>>(&self, value: T::TagType, mode: TagMergeMode)
     where
         T::TagType: ToSendValue;
 }
 
 impl<O: IsA<TagSetter>> TagSetterExtManual for O {
-    fn add<'a, T: Tag<'a>>(&mut self, value: T::TagType, mode: TagMergeMode)
+    fn add<'a, T: Tag<'a>>(&self, value: T::TagType, mode: TagMergeMode)
     where
         T::TagType: ToSendValue,
     {