fix(completion): set pum_size even if ext_popupmenu is used (#20648)

This allows CompleteChanged event to get the correct `v:event.size`.
It should be harmless and more consistent to also set `pum_array`.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/nvim/popupmenu.c b/src/nvim/popupmenu.c
index 74376c8b8a..3a3f966d10 100644
--- a/src/nvim/popupmenu.c
+++ b/src/nvim/popupmenu.c
@@ -264,12 +264,15 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed, i
       pum_row = above_row;
       pum_height = pum_win_row - above_row;
     }
+
+    pum_array = array;
+    // Set "pum_size" before returning so that pum_set_event_info() gets the correct size.
+    pum_size = size;
+
     if (pum_external) {
       return;
     }
 
-    pum_array = array;
-    pum_size = size;
     pum_compute_size();
     int max_width = pum_base_width;