Patch-Source: https://github.com/archlinux/svntogit-packages/blob/6d9588627d43ed7412d350ac33fa82e8551489a7/trunk/metainfo.patch
diff -Naur thunderbird-78.9.1.orig/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml thunderbird-78.9.1/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml
--- thunderbird-78.9.1.orig/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml	2021-04-17 02:05:05.808596043 +0000
+++ thunderbird-78.9.1/comm/mail/branding/thunderbird/net.thunderbird.Thunderbird.appdata.xml	2021-04-17 02:06:12.052455998 +0000
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop-application">
   <id>net.thunderbird.Thunderbird</id>
+  <launchable type="desktop-id">thunderbird.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
   <name>Thunderbird</name>
   <summary>Thunderbird is a free and open source email, newsfeed, chat, and calendaring client</summary>