fix(marks): adjust marks when unloading "nofile" buffer #39118

Problem:  Marks are not adjusted unloading a buffer that doesn't exist
          on disk. E.g. extmarks are still valid (and will be beyond the
          end of the buffer if the buffer is reloaded), even though the
          text is lost.
Solution: Adjust marks for a cleared buffer when unloading a buffer that
          doesn't exist on disk.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/functional/api/extmark_spec.lua b/test/functional/api/extmark_spec.lua
index 3245eba80c..911d9fb0bf 100644
--- a/test/functional/api/extmark_spec.lua
+++ b/test/functional/api/extmark_spec.lua
@@ -1959,6 +1959,16 @@ describe('API/extmarks', function()
       },
     }
   end)
+
+  it('are invalidated when "nofile" buffer is unloaded', function()
+    local buf = api.nvim_create_buf(false, true)
+    api.nvim_buf_set_name(buf, 'foo')
+    api.nvim_buf_set_lines(buf, 0, 0, false, { 'foo', 'bar' })
+    local id = api.nvim_buf_set_extmark(buf, ns, 1, 0, { invalidate = true })
+    api.nvim_buf_delete(buf, { unload = true })
+    local mark = { 0, 0, { invalid = true, invalidate = true, ns_id = 3, right_gravity = true } }
+    eq(mark, api.nvim_buf_get_extmark_by_id(buf, ns, id, { details = true }))
+  end)
 end)
 
 describe('Extmarks buffer api with many marks', function()