tkdiff: patch to trigger recursive inline diffs

add patch to fix regression to trigger recursive inline diffs when
selected

pkgs/by-name/tk/tkdiff/194.patch

@@ -0,0 +1,15 @@
+Index: tkdiff
+===================================================================
+diff --git a/tkdiff b/tkdiff
+--- a/tkdiff	(revision 193)
++++ b/tkdiff	(revision 194)
+@@ -4557,7 +4557,8 @@
+                 }
+             }
+         }
+-    }
++        # But KICK scroll to *LOOK* for Ratcliff (when ON); otherwise is a NOOP
++    } { $w(acTxWdg) SEE @1,1 }
+ }
+ 
+ ###############################################################################

pkgs/by-name/tk/tkdiff/package.nix

@@ -9,9 +9,16 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-EpbIdjsejkkTaSpoZRM5AHz0r1Cio+YzRryK0BoghBk=";
   };
 
-  # fix regression: allow /dev/null again. eg: "tkdiff /dev/null file"
+  patches = [
-  # svn diff --git -r188:189 https://svn.code.sf.net/p/tkdiff/code/trunk
+    # fix regression: allow /dev/null again. eg: "tkdiff /dev/null file"
-  patches = [ ./189.patch ];
+    # svn diff --git -r188:189 https://svn.code.sf.net/p/tkdiff/code/trunk
+    ./189.patch
+
+    # fix regression: trigger redraw when inline recursive diff requested
+    # svn diff --git -r193:194 https://svn.code.sf.net/p/tkdiff/code/trunk | \
+    #   sed -e '/^@@ -4545,7/,14d' -e '/^@@ -18063,7/,$d'
+    ./194.patch
+  ];
 
   nativeBuildInputs = [ makeBinaryWrapper ];