Add a screenshot to the README

The previous placement was ultra-fallbacky, "info" was picked instead.

README.adoc

@@ -8,6 +8,8 @@ or whatever gdk-pixbuf loads.
 Its development status can be summarized as '`beta`'.
 E.g., certain GIFs animate wrong.
 
+image::fiv.webp["Screenshot of both the browser and the viewer"]
+
 Non-goals
 ---------
  - fancy UI--the focus is on speed of use first, colour accuracy second

meson.build

@@ -83,20 +83,25 @@ if gdkpixbuf.found()
 		dependencies : [dependencies, gdkpixbuf])
 endif
 
-install_data('fiv.desktop',
-	install_dir : get_option('datadir') + '/applications')
+# XXX: With gdk-pixbuf, this even dependens on currently installed modules.
+if meson.is_cross_build()
+	install_data('fiv.desktop',
+		install_dir : get_option('datadir') + '/applications')
+else
+	# XXX: The exe path may not contain spaces--quoting is a bitch in Meson.
+	desktop = custom_target('desktop',
+		output : 'fiv.desktop',
+		input : 'fiv.desktop',
+		command : ['sh', '-c', '''awk '/^MimeType=/ { $0 = "MimeType=";
+			while ((exe " --list-supported-media-types" | getline type) > 0)
+				$0 = $0 type ";" } 1' "exe=$1" "$2"''', 'sh', exe, '@INPUT@'],
+		capture : true,
+		install : true,
+		install_dir : get_option('datadir') + '/applications',
+	)
+endif
+
 install_data('fiv-browse.desktop',
 	install_dir : get_option('datadir') + '/applications')
 install_data('fiv.svg',
 	install_dir : get_option('datadir') + '/icons/hicolor/scalable/apps')
-
-# TODO(p): Replace this with custom_target().
-if not meson.is_cross_build()
-	meson.add_install_script(
-		'sh', '-c', '''sed -i "/^MimeType=/{c \\
-MimeType=$($1 --list-supported-media-types | tr "\\012" ";")
-}" "$MESON_INSTALL_DESTDIR_PREFIX/$2"''',
-		'sh',
-		exe.full_path(),
-		get_option('datadir') + '/applications/fiv.desktop')
-endif

resources/resources.gresource.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
-	<gresource prefix="/org/gnome/design/IconLibrary/">
+	<gresource prefix="/org/gnome/design/IconLibrary/scalable/actions/">
 		<file preprocess="xml-stripblanks">circle-filled-symbolic.svg</file>
 		<file preprocess="xml-stripblanks">funnel-symbolic.svg</file>
 		<file preprocess="xml-stripblanks">blend-tool-symbolic.svg</file>