&conceallevel > 0 の状態で cursorline, cursorcolumn, relativenumber のいずれかを設定すると、
<C-D> で CLPUM が表示されないことがあります。

[repro steps]

vimrc:

if exists('+clpum')
    set clpum
    set clpumheight=40
    set clcompleteopt+=noinsert
endif
set cole=1 cul

vim -u vimrc -N
:set <C-D>

expected: CLPUM が表示される
actual: CLPUM が表示されない

内部的には処理が実行されているので、<C-N> 等で候補選択すると CLPUM が表示されます。

[investigation]

[solution proposal]

上記箇所の判定に && !clpum_visible() を追加することで領域の再描画を回避できました。

https://groups.google.com/d/msg/vim_dev/E3zq6C_b23k/oRpPXkU9AwAJ

$ vim -Nu NONE -c "set wmnu wim=popup"

typed

:set <Tab><C-R>=

Actual behavior:

• E523 occurred
• The cursor position is wrong.

How to reproduce:

• Start pure vim with some options.
  $ vim -Nu NONE -c "set wmnu wim=popup ch=2"
• Execute :a command.
  :a
• Paste some code from clipboard.

Expected behavior:

• Correct code is pasted.

Actual behavior:

• Inorrect code is pasted and popup-menu displayed unexpectedly.

https://groups.google.com/d/msg/vim_dev/E3zq6C_b23k/sEmckDA9AwAJ

Now behavior:

- When 'clpum' option is on.
  - `<TAB>` behavior:
    When not started CLPUM, conform to 'wildmenu' and 'wildmode'. 
    When started CLPUM, Use the next match.  This match replaces the previous one.

  - `<C-D>` behavior:
    When not started CLPUM, CLPUM is triggered.  
    When started CLPUM, Use the next match.  This match replaces the previous one.

I'll change to the following behavior.

- When 'clpum' option is on.
  - `<TAB>` and `<C-D>` behavior:
    When not started CLPUM, CLPUM is triggered.  
    When started CLPUM, Use the next match.  This match replaces the previous one.

Hi!
Thanks for making this patch, I hope it gets included in Vim.

When popup menu is overlapping terminal window it is not cleared when closed. The issue and a fix are both related to vim#2908

diff --git a/src/clpum.c b/src/clpum.c
index 22ec3a487..c8b7025e2 100644
--- a/src/clpum.c
+++ b/src/clpum.c
@@ -394,7 +394,7 @@ clpum_undisplay(void)
     //FreeWild(clpum_size, clpum_array);
     clpum_array = NULL;
     //clpum_size = -1;
-    redraw_all_later(SOME_VALID);
+    redraw_all_later(NOT_VALID);
 #ifdef FEAT_WINDOWS
     redraw_tabline = TRUE;
 #endif

How to reproduce:

$ vim -N -u NONE -c "set clpum"

:set <C-D>

Continue to press the <C-D>.

How to reproduce:

• Start pure Vim with some options.
  $vim -Nu NONE -c "set wmnu wim=popup"
• clpum triggerd.
  :set <TAB>

Expected behavior:

A popup menu is displayed and command-line stay :set. Because option clcot default value is "menuone,noinsert".

Actual behavior:

A popup menu is displayed and command-line completed to :set all. Unexpected completion.

Step to reproduce:

in Vim clone directory (:cd vim/src)

1. Start pure Vim and some options.
   $ vim -Nu NONE -c "set wmnu wim=popup clcot=menu,noinsert"
2. Start filename completion and select "testdir/" by up/down cursor key.
   :cd <TAB>↑↑↑↑
3. Type right cursor key and select "testdir/pythonx/" by up/down cursor key.
   →↓↓↓↓
4. Type right cursor key.
   →

Expect behavior:

• Popup is undisplayed.

Actual behavior:

• Previous popup was displayed.

When command-line cursor position + complete item length > Columns in CLPUM, command-line and last line message become scramble.

How to reproduce:

• Terminal size is 80x24.
• Start Vim.
  $ ./vim -N -u NONE -c "set clpum ch=2"
• input below.
  :set w
  (:set + 75 spaces + w)
• Start CLPUM.
  <C-D>

Expected behaivior:

• Command-line and last line message each appear.
  (Command-line maybe scrolled 1 up)

Actual behaivior:

• It is scramble to display.

input() 関数を第3引数つき(補完つき)で呼び出すと、補完を開始したタイミングで落ちます。

Environment

• Windows 10 64bit
• MINGW64 でビルド

How to reproduce

gvim -N -u NONE または vim -N -u NONE

で起動した後、
以下のスクリプトを読み込みます(cmdlineから入力しても再現可能)

set wildmenu wildmode=popup
call input('', '', 'option')

<TAB> を何度か叩きます。

With the following settings:

  set wildmode=popup
  set wildmenu
  set clcompleteopt=menu

Enter:

• :colorsch
• Press <tab>
• Press <c-y>
• Instead of accepting selection ^Y is inserted.

The following is what fixed it for me.

diff --git a/src/ex_getln.c b/src/ex_getln.c
index 6b19c8c8c..0673418b6 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -8969,8 +8969,7 @@ clpum_compl_prep(int c)
 	     * the selection without inserting anything.  When
 	     * clpum_compl_enter_selects is set the Enter key does the same. */
 	    if ((c == Ctrl_Y || (clpum_compl_enter_selects
-				   && (c == CAR || c == K_KENTER || c == NL)))
-		    && clpum_visible())
+				   && (c == CAR || c == K_KENTER || c == NL))))
 		retval = TRUE;
 
 	    /* CTRL-E means completion is Ended, go back to the typed text. */

SEGV occurs when using <C-R>= expansion.

[environment]
Vim 7.4.1832 on Ubuntu 16.04

[repro steps]

$ cat test.vim
if has('clpum')
  set wildmode=popup
  set wildmenu
endif
$ vim -Nu NONE -S test.vim

input keys,

:<C-R>=<CR><TAB>

and SEGV occurs.

[cause]

stacktrace.1 (when expansion)

#0  getcmdline (firstc=61, count=0, indent=0) at ex_getln.c:387
#1  0x000000000050c053 in get_expr_register () at ops.c:784
#2  0x00000000004897e5 in getcmdline (firstc=58, count=1, indent=0) at ex_getln.c:1454
#3  0x000000000048b05b in getexline (c=58, cookie=0x0, indent=0) at ex_getln.c:2497
#4  0x0000000000470d4c in do_cmdline (cmdline=0x0, fgetline=0x48b01e <getexline>, cookie=0x0, flags=0) at ex_docmd.c:1003
#5  0x0000000000503254 in nv_colon (cap=0x7fff060f2710) at normal.c:5320
#6  0x00000000004fc5ff in normal_cmd (oap=0x7fff060f27a0, toplevel=1) at normal.c:1149
#7  0x00000000005ec25c in main_loop (cmdwin=0, noexmode=0) at main.c:1359
#8  0x00000000005ebc4c in main (argc=7, argv=0x7fff060f2a88) at main.c:1051

stacktrace.2 (received SEGV)

#0  0x000000000048d962 in ExpandInit (xp=0x0) at ex_getln.c:4103
#1  0x0000000000475435 in set_one_cmd_context (xp=0x0, buff=0xc44940 "edit ") at ex_docmd.c:3422
#2  0x000000000048eacc in set_cmd_context (xp=0x0, str=0xc44940 "edit ", len=5, col=5) at ex_getln.c:4784
#3  0x0000000000496643 in clpum_complete (c=9) at ex_getln.c:8866
#4  0x00000000004889a7 in getcmdline (firstc=58, count=1, indent=0) at ex_getln.c:1102
#5  0x000000000048b05b in getexline (c=58, cookie=0x0, indent=0) at ex_getln.c:2497
#6  0x0000000000470d4c in do_cmdline (cmdline=0x0, fgetline=0x48b01e <getexline>, cookie=0x0, flags=0) at ex_docmd.c:1003
#7  0x0000000000503254 in nv_colon (cap=0x7fff060f2710) at normal.c:5320
#8  0x00000000004fc5ff in normal_cmd (oap=0x7fff060f27a0, toplevel=1) at normal.c:1149
#9  0x00000000005ec25c in main_loop (cmdwin=0, noexmode=0) at main.c:1359
#10 0x00000000005ebc4c in main (argc=7, argv=0x7fff060f2a88) at main.c:1051

It nests getcmdline, so clpum_compl_xp points NULL when entering clpum_complete.

getcmdline              # L383: set clpum_compl_xp to &xpc
__get_expr_register
____getcmdline          # L383: set clpum_compl_xp to &xpc
                        # and L2218: set clpum_compl_xp to NULL
__clpum_complete        # clpum_compl_xp is NULL

How to reproduce:

$ vim -Nu NONE -c 'set clpum clcot=menu,noinsert'

:set clcot=<TAB>

Expected behavior:
menu,noinsert is complemented.

Actual behavior:
Nothing complemented.

Remarks:
It is complemented with the use of the <C-D> instead of <TAB>.
I checked by CUI Vim 7.4.1290 on fedora Linux.

I'll rename to popup.
Are you OK?

How to reproduce:

• Start pure vim with some options.
  $ vim -Nu NONE -c "set wmnu wim=popup ch=2"
• Press the completion key to enter a command that does not exist.
  :xxxxxxxx
• Enter the following key.
  

Expected behavior:

• The screen does not change.

Actual behavior:

• Previous command was displayed. (command-line history function is activated)

Problem

With vim --clean, Shift-Tab in command-line completes the last filename.
I want clpum to show popup even when pressing Shift-Tab.

Sorry, I tried this only in CUI Vim.

Steps to reproduce

vimrc

set wildmode=popup
set wildmenu
set clpumheight=40

1. vim --clean -S clpum.vim
2. :e <S-Tab>

It does not show popup.
It works the same as plain vim behavior.

Environment

WSL Debian 9.5
Microsoft Windows 10 Pro 64bit 10.0.17134

How to reproduce:

• Start pure Vim with enable clpum.
  $ vim -N -u NONE -c "set clpum"
• Input below.
  :abcde<C-B>set w
• Start CLPUM and insert second item.
  <Tab><Tab>
• Stop CLPUM and go back to the originally typed text.
  <C-E>

Expected behavior:

• The following characters are displayed on the command line. (| is cursor)
  :set w|abcde

Actual behavior:

• Displayed this. Where is abcde gone?
  :set w|

Thing like 'pumwidth'.

Problem

The first item bar is selected in completion menu, but not inserted to command-line
when pressing <Tab> to complete file paths.

Steps to reproduce

set wildmode=popup
set wildmenu
set clpumheight=40

$ ls -1 tmp
bar
baz
foo

1. vim --clean -S clpum.vim
2. :e tmp/<Tab>

It shows bar, baz, foo in completion menu, and the first item bar is selected.
But bar is not inserted to command-line.
So the next <Tab> selects and inserts the second item baz not the first item bar.

Add built-in function clcomplete(), clcomplete_add() and clcomplete_check() instead of complete(), complete_add() and complete_check().

--with-features=small and --with-features=tiny build fails.

Hoe to reproduce:

$ vim -N -u NONE -c "set clpum"

:<C-X>

Expected behavior:

• Display below.
  E764: Option 'clcompletefunc' is not set

Actual behavior:

• Nothing to output.

Because the same function is present longest in the 'wildmenu' option.

• When terminal size changed by mouse. (CUI)
• When FocusLost event was triggered. (GUI)
• When became no matched item.
• ...

The last line message (e.g. -- Command-line mode completion (^D^N^P) match 1 of 363) disappear.

In case of Windows (build by MSYS2):

./gvimd.exe -Nu NONE -c "set wmnu wim=popup ch=2"

:set

Expected behavior:

:set termcap_ (_ is cursor)

Actual behavior:

:set _