commit https://github.com/vim/vim/commit/c9fb77c69244870a97384152f20845665c19fe39 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 9 21:51:40 2016 +0200 patch 7.4.2188 Problem: Completion does not work properly with some plugins. Solution: Revert the part related to typing CTRL-E. (closes https://github.com/vim/vim/issues/972)

--- a/src/edit.c
+++ b/src/edit.c
@@ -3893,7 +3893,7 @@ ins_compl_prep(int c)
 
 	    /* CTRL-E means completion is Ended, go back to the typed text.
 	     * but only do this, if the Popup is still visible */
-	    if (c == Ctrl_E && pum_visible())
+	    if (c == Ctrl_E)
 	    {
 		ins_compl_delete();
 		if (compl_leader != NULL)