[gtk/private-x11-types] Do not parse all GDK-X11 source files

[Emmanuele Bassi <ebassi src gnome org>]

commit 37c3ba264546432fe874a6e60230b17a2fa00c90
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 7 16:46:12 2020 +0100

    Do not parse all GDK-X11 source files
    
    We don't need all of them, only the ones that contain public API. This
    allows us to reduce the chance of a stray symbol getting incorrectly
    added to the introspection data.

 gdk/x11/meson.build | 38 +++++++++++++++++++++++---------------
 gtk/meson.build     |  2 +-
 2 files changed, 24 insertions(+), 16 deletions(-)
---
diff --git a/gdk/x11/meson.build b/gdk/x11/meson.build
index 6db7e695b3..f846450c3b 100644
--- a/gdk/x11/meson.build
+++ b/gdk/x11/meson.build
@@ -1,36 +1,44 @@
+# A list of sources that contain public API; these are the sources that
+# will be introspected for the GdkX11 namespace.
+#
 # Note: gdksettings.c gets included from xsettings-client.c, do not add here
-gdk_x11_sources = files([
-  'gdkapplaunchcontext-x11.c',
-  'gdkasync.c',
-  'gdkcairocontext-x11.c',
-  'gdkclipboard-x11.c',
+gdk_x11_public_sources = files([
   'gdkcursor-x11.c',
   'gdkdevice-xi2.c',
   'gdkdevicemanager-x11.c',
   'gdkdevicemanager-xi2.c',
   'gdkdisplay-x11.c',
-  'gdkdrag-x11.c',
-  'gdkdrop-x11.c',
-  'gdkeventsource.c',
-  'gdkeventtranslator.c',
   'gdkglcontext-x11.c',
   'gdkkeys-x11.c',
-  'gdkmain-x11.c',
   'gdkmonitor-x11.c',
   'gdkproperty-x11.c',
   'gdkscreen-x11.c',
   'gdkselection-x11.c',
-  'gdkselectioninputstream-x11.c',
-  'gdkselectionoutputstream-x11.c',
-  'gdktextlistconverter-x11.c',
   'gdkvisual-x11.c',
-  'gdkvulkancontext-x11.c',
   'gdksurface-x11.c',
-  'gdkxftdefaults.c',
   'gdkxid.c',
   'xsettings-client.c',
 ])
 
+# All sources
+gdk_x11_sources = gdk_x11_public_sources + [
+  'gdkapplaunchcontext-x11.c',
+  'gdkasync.c',
+  'gdkcairocontext-x11.c',
+  'gdkclipboard-x11.c',
+  'gdkdrag-x11.c',
+  'gdkdrop-x11.c',
+  'gdkeventsource.c',
+  'gdkeventtranslator.c',
+  'gdkmain-x11.c',
+  'gdkselectioninputstream-x11.c',
+  'gdkselectionoutputstream-x11.c',
+  'gdktextlistconverter-x11.c',
+  'gdkvulkancontext-x11.c',
+  'gdkxftdefaults.c',
+]
+
+# Public headers; will be installed and introspected
 gdk_x11_public_headers = files([
   'gdkx-autocleanups.h',
   'gdkx11applaunchcontext.h',
diff --git a/gtk/meson.build b/gtk/meson.build
index d35f79630d..c7627af5f0 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -1044,7 +1044,7 @@ if build_gir
 
   if x11_enabled
     gdk_x11_gir = gnome.generate_gir(libgtk,
-                                     sources: gdk_x11_public_headers + gdk_x11_sources,
+                                     sources: gdk_x11_public_headers + gdk_x11_public_sources,
                                      namespace: 'GdkX11',
                                      nsversion: gtk_api_version,
                                      identifier_prefix: 'Gdk',