fix(inccommand): save and restore '[ and '] marks (#26442)

Undoing a change moves '[ and '] marks, so it is necessary to save and
restore them.

1 files changed, 24 insertions, 0 deletions

diff --git a/test/functional/ui/inccommand_spec.lua b/test/functional/ui/inccommand_spec.lua
index 3ee67a710c..ae6d0e6487 100644
--- a/test/functional/ui/inccommand_spec.lua
+++ b/test/functional/ui/inccommand_spec.lua
@@ -8,6 +8,7 @@ local feed_command = helpers.feed_command
 local expect = helpers.expect
 local feed = helpers.feed
 local insert = helpers.insert
+local funcs = helpers.funcs
 local meths = helpers.meths
 local neq = helpers.neq
 local ok = helpers.ok
@@ -153,6 +154,29 @@ describe(":substitute, 'inccommand' preserves", function()
     ]])
   end)
 
+  it("'[ and '] marks #26439", function()
+    local screen = Screen.new(30, 10)
+    common_setup(screen, 'nosplit', ('abc\ndef\n'):rep(50))
+
+    feed('ggyG')
+    local X = meths.get_vvar('maxcol')
+    eq({0, 1, 1, 0}, funcs.getpos("'["))
+    eq({0, 101, X, 0}, funcs.getpos("']"))
+
+    feed(":'[,']s/def/")
+    poke_eventloop()
+    eq({0, 1, 1, 0}, funcs.getpos("'["))
+    eq({0, 101, X, 0}, funcs.getpos("']"))
+
+    feed('DEF/g')
+    poke_eventloop()
+    eq({0, 1, 1, 0}, funcs.getpos("'["))
+    eq({0, 101, X, 0}, funcs.getpos("']"))
+
+    feed('<CR>')
+    expect(('abc\nDEF\n'):rep(50))
+  end)
+
   for _, case in pairs{"", "split", "nosplit"} do
     it("various delimiters (inccommand="..case..")", function()
       insert(default_text)