fix(column): pass kFalse when initializing "b_signcols.count"

Problem:  Wrong "clear" argument passed to buf_signcols_count_range
          when initializing "b_signcols.count" for the first time.
Solution: Pass kFalse so that the "nested" counter is not incorrectly
          decremented.

1 files changed, 9 insertions, 0 deletions

diff --git a/test/functional/ui/sign_spec.lua b/test/functional/ui/sign_spec.lua
index 5e45c3113b..29ec08e15c 100644
--- a/test/functional/ui/sign_spec.lua
+++ b/test/functional/ui/sign_spec.lua
@@ -539,4 +539,13 @@ describe('Signs', function()
                                                            |
     ]])
   end)
+
+  it('no negative b_signcols.count with undo after initializing', function()
+    exec([[
+      set signcolumn=auto:2
+      call setline(1, 'a')
+      call nvim_buf_set_extmark(0, nvim_create_namespace(''), 0, 0, {'sign_text':'S1'})
+      delete | redraw | undo
+    ]])
+  end)
 end)