[gimp] libgimp: reduce GObject Introspection warnings.

[Jehan <jehanp src gnome org>]

commit 8cf4b7a43a3aa5424e513898ab207ad1460d464f
Author: Jehan <jehan girinstud io>
Date:   Thu Oct 10 12:26:26 2019 +0200

    libgimp: reduce GObject Introspection warnings.
    
    Thanks to Massimo for helping:
    
    > To reduce the number of warnings down to 2, it is necessary to list
    > gimptypes.h and gimpenums.h right after gimp.h and gimpui.h
    > gimpuitypes.h at the start of libgimpui_headers_introspectable like
    > they are in the corresponding list in Makefile.gi.
    >
    > Their order evidently matters
    
    See #4018.
    Some stuff are still wrong, but this is a first step in the right
    direction.

 libgimp/meson.build | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/libgimp/meson.build b/libgimp/meson.build
index 3ef9085edf..7606eb8a92 100644
--- a/libgimp/meson.build
+++ b/libgimp/meson.build
@@ -182,12 +182,16 @@ libgimp_sources = [
 ]
 
 libgimp_headers_introspectable = [
+  # Order matters. Leave these headers at the top.
   'gimp.h',
+  'gimptypes.h',
+  'gimpenums.h',
+
+  # Other headers
   'gimpbrushselect.h',
   'gimpchannel.h',
   'gimpdisplay.h',
   'gimpdrawable.h',
-  'gimpenums.h',
   'gimpfileprocedure.h',
   'gimpfontselect.h',
   'gimpgimprc.h',
@@ -209,7 +213,6 @@ libgimp_headers_introspectable = [
   'gimpsaveprocedure.h',
   'gimpselection.h',
   'gimpthumbnailprocedure.h',
-  'gimptypes.h',
   'gimpvectors.h',
   pdb_wrappers_headers,
 ]
@@ -247,6 +250,11 @@ libgimpui_sources = [
 ]
 
 libgimpui_headers_introspectable = [
+  # Order matters. Leave these headers at the top.
+  'gimpui.h',
+  'gimpuitypes.h',
+
+  # Other headers
   'gimpaspectpreview.h',
   'gimpbrushselectbutton.h',
   'gimpdrawablepreview.h',
@@ -263,8 +271,6 @@ libgimpui_headers_introspectable = [
   'gimpprocview.h',
   'gimpprogressbar.h',
   'gimpselectbutton.h',
-  'gimpui.h',
-  'gimpuitypes.h',
   'gimpzoompreview.h',
 ]