fix(folds): handle visual blockwise indent insertion correctly (#22898)

Previously, the fold information was incorrect because it wasn't
being updated during the blockwise insertion.
(Solution by zeertzjq)

2 files changed, 12 insertions, 2 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index d2e9fda7d9..c6564e427e 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -623,9 +623,9 @@ static void block_insert(oparg_T *oap, char *s, int b_insert, struct block_def *
     }
   }   // for all lnum
 
-  changed_lines(oap->start.lnum + 1, 0, oap->end.lnum + 1, 0L, true);
-
   State = oldstate;
+
+  changed_lines(oap->start.lnum + 1, 0, oap->end.lnum + 1, 0L, true);
 }
 
 /// Handle reindenting a block of lines.
diff --git a/test/functional/editor/fold_spec.lua b/test/functional/editor/fold_spec.lua
index 00e83bedc8..01a30f87bf 100644
--- a/test/functional/editor/fold_spec.lua
+++ b/test/functional/editor/fold_spec.lua
@@ -359,4 +359,14 @@ a]], '13m7')
     eq(10, funcs.foldclosedend(7))
     eq(14, funcs.foldclosedend(11))
   end)
+  it('updates correctly with indent method and visual blockwise insertion', function()
+    insert([[
+    a
+    b
+    ]])
+    feed_command('set foldmethod=indent', 'set shiftwidth=2')
+    feed('gg0<C-v>jI  <Esc>') -- indent both lines using visual blockwise mode
+    eq(1, funcs.foldlevel(1))
+    eq(1, funcs.foldlevel(2))
+  end)
 end)