From a775e9fb4188f2638111c15623ea9bd5c804b3e2 Mon Sep 17 00:00:00 2001
From: mitchell <70453897+orbitalquark@users.noreply.github.com>
Date: Fri, 30 Apr 2021 11:16:46 -0400
Subject: When filtering through, do not replace buffer contents if nothing
 changed. This will clear the redo stack, which can be unhelpful when
 formatting code on save, for example.

---
 modules/textadept/editing.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'modules')

diff --git a/modules/textadept/editing.lua b/modules/textadept/editing.lua
index 540c5aec..06743709 100644
--- a/modules/textadept/editing.lua
+++ b/modules/textadept/editing.lua
@@ -628,7 +628,9 @@ function M.filter_through(command)
       return
     end
   end
-  buffer:replace_target(output:iconv('UTF-8', _CHARSET))
+  output = output:iconv('UTF-8', _CHARSET)
+  if buffer:get_text() == output then return end -- do not perform no-op
+  buffer:replace_target(output)
   view.first_visible_line = top_line
   if s == e then
     buffer:goto_pos(s)
-- 
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