Fix building devel docs

[skip changelog]

Signed-off-by: Nils Philippsen <nils@tiptoe.de>

0001-libgimp-Use-namespaced-doc-reference.patch

@@ -0,0 +1,48 @@
+From c7e1b11bed0d001323471e774564f065bcfd62f6 Mon Sep 17 00:00:00 2001
+From: Nils Philippsen <nils@tiptoe.de>
+Date: Mon, 19 Aug 2024 16:16:31 +0200
+Subject: [PATCH] libgimp: Use namespaced doc reference
+
+Otherwise, building the devel docs errors out like this:
+
+```
+FAILED: devel-docs/reference/gimp/libgimp-3.0
+...
+WARNING: Unknown namespace ExportReturn
+[enum@ExportReturn.EXPORT].
+^~~~~~~~~~~~~~~~~~~~~~~~~~
+```
+
+Signed-off-by: Nils Philippsen <nils@tiptoe.de>
+---
+ libgimp/gimpexportoptions.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/libgimp/gimpexportoptions.c b/libgimp/gimpexportoptions.c
+index 22fca36c2d..5ffae2a1b1 100644
+--- a/libgimp/gimpexportoptions.c
++++ b/libgimp/gimpexportoptions.c
+@@ -537,17 +537,17 @@ export_action_perform (const ExportAction *action,
+  *
+  * If necessary, a copy is created, converted and modified, @image
+  * changed to point to the new image and the procedure returns
+- * [enum@ExportReturn.EXPORT].
++ * [enum@Gimp.ExportReturn.EXPORT].
+  * In this case, you must take care of deleting the created image using
+  * [method@Image.delete] once the image has been exported, unless you
+  * were planning to display it with [ctor@Display.new], or you will leak
+  * memory.
+  *
+- * If [enum@ExportReturn.IGNORE] is returned, then @image is still the
++ * If [enum@Gimp.ExportReturn.IGNORE] is returned, then @image is still the
+  * original image. You should neither modify it, nor should you delete
+  * it in the end. If you wish to temporarily modify the image before
+  * export anyway, call [method@Image.duplicate] when
+- * [enum@ExportReturn.IGNORE] was returned.
++ * [enum@Gimp.ExportReturn.IGNORE] was returned.
+  *
+  * Returns: An enum of #GimpExportReturn.
+  *
+-- 
+2.46.0
+

gimp.spec

@@ -234,6 +234,12 @@ Patch3:         gimp-2.99.19-external-help-browser.patch
 # Don’t require an unreleased gegl version
 Patch4:         0001-Don-t-require-unreleased-gegl-version.patch
 
+# Submitted upstream:
+
+# libgimp: Use namespaced doc reference
+# https://gitlab.gnome.org/GNOME/gimp/-/merge_requests/1789
+Patch5:         0001-libgimp-Use-namespaced-doc-reference.patch
+
 %description
 GIMP (GNU Image Manipulation Program) is a powerful image composition and
 editing program, which can be extremely useful for creating logos and other
@@ -297,6 +303,7 @@ EOF
 %patch 2 -p1 -b .no-phone-home-default
 %patch 3 -p1 -b .external-help-browser
 %patch 4 -p1 -b .don-t-require-unreleased-gegl-version
+%patch 5 -p1 -b .namespace-docs-refs
 
 # Verify the splash file source hasn’t changed
 sha256sum -c %{SOURCE2}