fix(api): load buffer first on nvim_buf_set_lines (#25823)

Fix #22670
Fix #8659

1 files changed, 15 insertions, 0 deletions

diff --git a/test/functional/api/buffer_spec.lua b/test/functional/api/buffer_spec.lua
index 9833ebee4c..6ed9aa574a 100644
--- a/test/functional/api/buffer_spec.lua
+++ b/test/functional/api/buffer_spec.lua
@@ -713,6 +713,21 @@ describe('api/buf', function()
       feed('<c-w>p')
       eq(3, funcs.winnr())
     end)
+
+    it('set_lines on unloaded buffer #8659 #22670', function()
+      local bufnr = curbuf('get_number')
+      meths.buf_set_lines(bufnr, 0, -1, false, {'a', 'b', 'c'})
+      meths.buf_set_name(bufnr, 'set_lines')
+      finally(function()
+        os.remove('set_lines')
+      end)
+      command('write!')
+      command('new')
+      command('bunload! '..bufnr)
+      local new_bufnr = funcs.bufnr('set_lines', true)
+      meths.buf_set_lines(new_bufnr, 0, -1, false, {})
+      eq({''}, meths.buf_get_lines(new_bufnr, 0, -1, false))
+    end)
   end)
 
   describe('nvim_buf_set_text', function()