[Gimp-developer] Checking type for a GimpDisplayShell in 2.3.16

[Michael Terry]

Hi all -

After presenting ingimp (http://www.ingimp.org) at LGM a week ago, it 
was suggested we port it to the 2.3.x developer branch. The port is 
almost complete, but I'm trying to understand a particular change 
between the 2.2.x and 2.3.x code trees.

In our interaction logging, we do a check to make sure a particular 
pointer is actually a GimpDisplayShell by using GIMP_IS_DISPLAY_SHELL(). 
In 2.2.x, this worked, but in 2.3.x there is a link error (undefined 
reference to gimp_display_shell_get_type). Our interaction logging code 
is linked in with app/core; where does this missing function reside so 
that we can use GIMP_IS_DISPLAY_SHELL?

Thanks for any help,

Michael Terry