[gtk+] Add a section about initialization to the migration guide



commit 47bc8603b0cb1676ce5887de3aeba511a5f85ad6
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 19 13:52:52 2017 -0500

    Add a section about initialization to the migration guide
    
    Just the facts.

 docs/reference/gtk/migrating-3to4.xml |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-3to4.xml b/docs/reference/gtk/migrating-3to4.xml
index 537aad0..f33cc15 100644
--- a/docs/reference/gtk/migrating-3to4.xml
+++ b/docs/reference/gtk/migrating-3to4.xml
@@ -261,6 +261,18 @@
         use.
       </para>
     </section>
+
+    <section>
+      <title>Stop passing commandline arguments to gtk_init()</title>
+      <para>
+        The gtk_init() and gtk_init_check() functions no longer accept commandline
+        arguments. Just call them without arguments. Other initialization functions
+        that were purely related to commandline argument handling, such as
+        gtk_parse_args() and gtk_get_option_group(), are gone. The APIs to
+        initialize GDK separately are also gone, but it is very unlikely
+        that you are affected by that.
+      </para>
+    </section>
   </section>
 
 </chapter>


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