GtkTextTag ref_count problem

[Jeff Franks <jcf tpg com au>]

 Hi,

If Havoc reads this; I'm still finding problems with some GTK+ 
references not being unreferenced. This time its GtkTextTag.

Brief background for others:

I have written some C++ classes that wrap GTK+-2.0 objects. These C++ 
wrappers don't increase or decrease a GTK+ object's reference count; 
that's left up to the user. However, a dynamic C++ wrapper's destruction 
does depends on the wrapped GTK+ object being unreferenced, so that when 
the reference count reaches zero a destroy-notifier function is called 
which deletes the C++ wrapper. I put some code in place to track 
operator new and operator delete calls to help identify possible memory 
leaks. It just prints out at the name of all undeleted objects.

GtkTextTag problem:

I have noticed that GtkTextTag's C++ wrapper never gets deleted and have 
tried to trace the problem. When a GtkTextBuffer is finalized it 
unreferences its GtkTextTagTable. When the GtkTextTagTable is finalized 
it calls the following line of code:

gtk_text_tag_table_foreach (table, foreach_unref, NULL);

which unreferences each tag in the table. At the start of this function 
a tag has a reference count of 2 and after being unreferenced it still 
has a reference count of 1. When you apply a tag the 
'gtk_text_buffer_real_apply_tag()' function gets called. This calls 
'_gtk_text_btree_tag()" which inturn calls 
'gtk_text_btree_get_tag_info()' which increases the reference count of a 
tag. Searching through the source code I couldn't find any where that 
the tag gets unreferenced again, except for 'foreach_unref()' in 
GtkTextTagTable. When I removed the line that increases the reference 
count I found that GtkTextBuffer, GtkTextTagTable and GtkTextTag still 
worked properly and the C++ wrappers were deleted.

Is this a bug or am I making a mistake somewhere?

Jeff.