Recover the complicated situation after my bad merge

I made a mistake merge.  Reverting it in c778945806 undid the state
on master, but now I realize it crippled the git merge mechanism.
As the merge contained a mix of commits from `master..staging-next`
and other commits from `staging-next..staging`, it got the
`staging-next` branch into a state that was difficult to recover.

I reconstructed the "desired" state of staging-next tree by:
 - checking out the last commit of the problematic range: 4effe769e2
 - `git rebase -i --preserve-merges a8a018ddc0` - dropping the mistaken
   merge commit and its revert from that range (while keeping
   reapplication from 4effe769e2)
 - merging the last unaffected staging-next commit (803ca85c20)
 - fortunately no other commits have been pushed to staging-next yet
 - applying a diff on staging-next to get it into that state

pkgs/development/libraries/harfbuzz/default.nix

@@ -11,7 +11,7 @@
 }:
 
 let
-  version = "2.7.1";
+  version = "2.7.2";
   inherit (stdenv.lib) optional optionals optionalString;
   mesonFeatureFlag = opt: b:
     "-D${opt}=${if b then "enabled" else "disabled"}";
@@ -24,7 +24,7 @@ stdenv.mkDerivation {
     owner  = "harfbuzz";
     repo   = "harfbuzz";
     rev    = version;
-    sha256 = "172jmwp666xbs6yy1pc2495gnkz8xw11b8zkz3j19jxlvvp4mxcs";
+    sha256 = "0vfyxr3lvzp80j1347nrwpr1ndv265p15rj2q8rj31lb26nyz4dm";
   };
 
   postPatch = ''