From 715901363a02634f5336c0d3f18cbd9a9c080b4a Mon Sep 17 00:00:00 2001
From: mitchell <70453897+orbitalquark@users.noreply.github.com>
Date: Fri, 30 Apr 2021 18:40:06 -0400
Subject: Replaced `events.FILE_{BEFORE,AFTER}_RELOAD` with
 `events.BUFFER_{BEFORE,AFTER}_REPLACE_TEXT`. This allows more features to
 save/restore state when buffer contents are replaced (e.g. file reload,
 filter through, etc.)

---
 modules/textadept/history.lua | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

(limited to 'modules/textadept/history.lua')

diff --git a/modules/textadept/history.lua b/modules/textadept/history.lua
index 8c784c17..f6238a0d 100644
--- a/modules/textadept/history.lua
+++ b/modules/textadept/history.lua
@@ -33,36 +33,15 @@ local view_history = setmetatable({}, {
   end
 })
 
-local restore_position, pos, first_visible_line = false, nil, nil
--- Restore position after a full-buffer undo/redo operation, e.g. after replacing buffer contents
--- with a formatting command and then performing an undo.
-events.connect(events.UPDATE_UI, function(updated)
-  if not restore_position or updated & buffer.UPDATE_SELECTION == 0 then return end
-  restore_position = false
-  buffer:goto_pos(pos)
-  view.first_visible_line, pos, first_visible_line = first_visible_line, nil, nil
-end)
-
+local INSERT, DELETE = buffer.MOD_INSERTTEXT, buffer.MOD_DELETETEXT
+local UNDO, REDO = buffer.PERFORMED_UNDO, buffer.PERFORMED_REDO
 -- Listens for text insertion and deletion events and records their locations.
 events.connect(events.MODIFIED, function(position, mod, text, length)
-  local buffer = buffer
-  -- Only interested in text insertion or deletion.
-  if mod & buffer.MOD_INSERTTEXT > 0 then
-    if length == buffer.length then
-      if mod & buffer.MULTILINEUNDOREDO > 0 then restore_position = true end
-      return -- ignore file loading or replacing buffer contents
-    end
-    position = position + length
-  elseif mod & buffer.MOD_DELETETEXT > 0 then
-    if buffer.length == 0 then return end -- ignore replacing buffer contents
-  elseif mod & (buffer.PERFORMED_UNDO | buffer.PERFORMED_REDO) > 0 and
-    (mod & buffer.MOD_BEFOREDELETE > 0) and length == buffer.length then
-    -- Save view state for potential undo before it's lost.
-    pos, first_visible_line = buffer.current_pos, view.first_visible_line
-  else
-    return
+  if mod & (INSERT | DELETE) == 0 or buffer.length == (mod & INSERT > 0 and length or 0) then
+    return -- ignore non-insertion/deletion, file loading, and replacing buffer contents
   end
-  if mod & (buffer.PERFORMED_UNDO | buffer.PERFORMED_REDO) > 0 then return end -- ignore undo/redo
+  if mod & INSERT > 0 then position = position + length end
+  if mod & (UNDO | REDO) > 0 then return end -- ignore undo/redo
   M.record(nil, buffer:line_from_position(position), buffer.column[position])
 end)
 
-- 
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