fix: register cmdline mappings synchronously on CmdlineEnter

Split the combined CmdlineEnter/InsertEnter subscription so that
CmdlineEnter runs the handler directly instead of through
async.debounce_next_tick. Deferring to the next tick can land after
mode detection has shifted, leaving cmp.core:prepare() unable to
register cmdline mappings while is_cmdline_mode() still returns true.

Partial port of upstream PR hrsh7th#2214 (hrsh7th#2214).
The PR's other change (reordering config merges in lua/cmp/config.lua) was
intentionally NOT applied: misc.merge resolves leaf collisions in favor of
its first argument, so the original order is what makes onetime / cmdline /
filetype / buffer override global. Adopting the PR's reordering would
invert the documented priority.

Co-authored-by: Arvid Petermann <arvidpetermann@googlemail.com>

Author: njhoffman

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.1.2](https://github.com/njhoffman/nvim-cmp/compare/v0.1.1...v0.1.2) (2026-04-25)
+
+### Bug Fixes
+
+- run the `CmdlineEnter` handler synchronously so `cmp.core:prepare()` registers cmdline mappings while `is_cmdline_mode()` still returns true (partial port of upstream [#2214](https://github.com/hrsh7th/nvim-cmp/pull/2214)). The PR's other change (config merge order) was deliberately not applied — it inverts the documented `onetime > cmdline > filetype > buffer > global` priority because `misc.merge` resolves leaf collisions in favor of `tbl1`, not `tbl2`.
+
 ## [0.1.1](https://github.com/njhoffman/nvim-cmp/compare/v0.1.0...v0.1.1) (2026-04-25)
 
 ### Bug Fixes

lua/cmp/autocmds.lua

@@ -12,7 +12,11 @@ local setup = function(cmp)
       cmp.core:on_change('InsertEnter')
     end
   end
-  autocmd.subscribe({ 'CmdlineEnter', 'InsertEnter' }, async.debounce_next_tick(on_insert_enter))
+  -- CmdlineEnter runs synchronously so cmp.core:prepare() registers cmdline
+  -- mappings while is_cmdline_mode() still returns true; the next-tick defer
+  -- used for InsertEnter loses that window.
+  autocmd.subscribe('CmdlineEnter', on_insert_enter)
+  autocmd.subscribe('InsertEnter', async.debounce_next_tick(on_insert_enter))
 
   local on_text_changed = function()
     if config.enabled() then