Add an XML message for "Show Proof Diffs"

Add menu item that uses this

1 files changed, 10 insertions, 0 deletions

diff --git a/test-suite/ide/proof-diffs.fake b/test-suite/ide/proof-diffs.fake
new file mode 100644
index 0000000000..594ebced23
--- /dev/null
+++ b/test-suite/ide/proof-diffs.fake
@@ -0,0 +1,10 @@
+ADD { Goal True /\ False /\ True = False. }
+ADD { split. }
+GOALS
+ADD here { split. }
+GOALS
+PDIFF here
+ADD there { auto. }
+GOALS
+PDIFF there
+ADD { Admitted. }