[meld] Update NEWS + appdata

[Kai Willadsen <kaiw src gnome org>]

commit 322f05876e841d1fa7a162d4c5a4e15226823b7c
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Sep 4 14:26:14 2022 +1000

    Update NEWS + appdata

 NEWS                                  | 16 ++++++++++++++++
 data/org.gnome.meld.appdata.xml.in.in | 15 +++++++++++++++
 2 files changed, 31 insertions(+)
---
diff --git a/NEWS b/NEWS
index 814428d8..2a1b2388 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,20 @@
 
+2022-09-04 meld 3.22.0
+======================
+
+  Fixes:
+
+   * Fix text filter changes on existing comparisons (Kai Willadsen)
+   * Build fixes (Kai Willadsen)
+   * Documentation updates (Kai Willadsen)
+
+  Translations:
+
+   * Anders Jonsson (sv)
+   * Emin Tufan Çetin (tr)
+   * Piotr Drąg (pl)
+
+
 2022-08-14 meld 3.21.3
 ======================
 
diff --git a/data/org.gnome.meld.appdata.xml.in.in b/data/org.gnome.meld.appdata.xml.in.in
index 1e234b80..89704c74 100644
--- a/data/org.gnome.meld.appdata.xml.in.in
+++ b/data/org.gnome.meld.appdata.xml.in.in
@@ -52,6 +52,21 @@
   <translation type="gettext">meld</translation>
   <content_rating type="oars-1.1" />
   <releases>
+    <release date="2022-09-04" version="3.22.0">
+      <description>
+        <p>
+          This is a new stable release series. Notable changes compared to 3.20 include:
+        </p>
+        <ul>
+          <li>A big UI refresh to better follow modern GNOME style</li>
+          <li>A new widget for displaying comparison paths with better information and manipulation</li>
+          <li>Support for comparing different files across panes in folder comparison</li>
+          <li>Many minor improvements to actions for manipulating documents, dealing with synchronisation 
points, rearranging panes, etc.</li>
+          <li>Improved support for dark themes</li>
+          <li>Updated translations</li>
+        </ul>
+      </description>
+    </release>
     <release date="2022-08-13" version="3.21.3">
       <description>
         <p>