community/appstream: backport patch to fix compose screenshot generator

Downstream issue: alpine/infra/compose/appstream-generator#2
Upstream discussion: https://github.com/ximion/appstream/issues/395

community/appstream/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Rasmus Thomsen <oss@cogitri.dev>
 pkgname=appstream
 pkgver=0.15.3
-pkgrel=0
+pkgrel=1
 pkgdesc="Provides a standard for creating app stores across distributions"
 url="https://distributions.freedesktop.org/wiki/AppStream"
 arch="all"
@@ -29,7 +29,9 @@ subpackages="
 	$pkgname-qt
 	$pkgname-lang
 	"
-source="https://www.freedesktop.org/software/appstream/releases/AppStream-$pkgver.tar.xz"
+source="https://www.freedesktop.org/software/appstream/releases/AppStream-$pkgver.tar.xz
+	fix-compose-screenshots.patch
+	"
 builddir="$srcdir/AppStream-$pkgver"
 
 # librsvg doesn't exist on these arches
@@ -91,4 +93,5 @@ qt() {
 
 sha512sums="
 f38eda7cb8da95fca2dbbd1aecca17ce74b2e3c438a82cffbd7485b24a3588fccbc91d8c5eb83d2840da1d9bde4e8ed73bcc1c68809581c982fac753f622b866  AppStream-0.15.3.tar.xz
+101ae7e2f6113a23801f1d9e8fcea13f63df98724452c4c926b8641979ae8665c1514f4ced30602d855ecdb8772ff2bb3a779d3b171274047ffbf0b9ece71495  fix-compose-screenshots.patch
 "

community/appstream/fix-compose-screenshots.patch

+diff --git c/compose/asc-utils-screenshots.c w/compose/asc-utils-screenshots.c
+index f42579eb..4e8beec8 100644
+--- c/compose/asc-utils-screenshots.c
++++ w/compose/asc-utils-screenshots.c
+@@ -410,7 +410,7 @@ asc_process_screenshot_images (AscResult *cres,
+ 	gboolean thumbnails_generated = FALSE;
+ 	g_autoptr(GError) error = NULL;
+ 
+-	imgs = as_screenshot_get_images (scr);
++	imgs = as_screenshot_get_images_all (scr);
+ 	if (imgs->len == 0) {
+ 		asc_result_add_hint_simple (cres, cpt, "metainfo-screenshot-but-no-media");
+ 		return NULL;
+@@ -434,7 +434,7 @@ asc_process_screenshot_images (AscResult *cres,
+ 		orig_img = g_object_ref (AS_IMAGE (g_ptr_array_index (imgs, 0)));
+ 
+ 	/* drop metainfo images */
+-	g_ptr_array_remove_range (imgs, 0, imgs->len);
++	as_screenshot_clear_images (scr);
+ 
+ 	orig_img_url = as_image_get_url (orig_img);
+ 	orig_img_locale = as_image_get_locale (orig_img);
+@@ -621,7 +621,7 @@ asc_process_screenshot_images (AscResult *cres,
+ 			continue;
+ 		}
+ 
+-		// finally prepare the thumbnail definition and add it to the metadata
++		/* finally prepare the thumbnail definition and add it to the metadata */
+ 		img = as_image_new ();
+ 		as_image_set_locale (img, orig_img_locale);
+ 		as_image_set_kind (img, AS_IMAGE_KIND_THUMBNAIL);
+diff --git c/src/as-screenshot.c w/src/as-screenshot.c
+index c2e722a7..dfad8910 100644
+--- c/src/as-screenshot.c
++++ w/src/as-screenshot.c
+@@ -264,6 +264,23 @@ as_screenshot_add_image (AsScreenshot *screenshot, AsImage *image)
+ 		g_ptr_array_add (priv->images_lang, g_object_ref (image));
+ }
+ 
++/**
++ * as_screenshot_clear_images:
++ * @screenshot: a #AsScreenshot instance.
++ *
++ * Remove all images associated with this screenshot.
++ *
++ * Since: 0.15.4
++ **/
++void
++as_screenshot_clear_images (AsScreenshot *screenshot)
++{
++	AsScreenshotPrivate *priv = GET_PRIVATE (screenshot);
++
++	g_ptr_array_remove_range (priv->images, 0, priv->images->len);
++	g_ptr_array_remove_range (priv->images_lang, 0, priv->images_lang->len);
++}
++
+ /**
+  * as_screenshot_get_videos:
+  * @screenshot: a #AsScreenshot instance.
+diff --git c/src/as-screenshot.h w/src/as-screenshot.h
+index 6901f39e..6fa886bb 100644
+--- c/src/as-screenshot.h
++++ w/src/as-screenshot.h
+@@ -104,6 +104,7 @@ AsImage				*as_screenshot_get_image (AsScreenshot *screenshot,
+ 							  guint height);
+ void				as_screenshot_add_image (AsScreenshot *screenshot,
+ 							 AsImage *image);
++void				as_screenshot_clear_images (AsScreenshot *screenshot);
+ 
+ GPtrArray			*as_screenshot_get_videos (AsScreenshot *screenshot);
+ void				as_screenshot_add_video (AsScreenshot *screenshot,