runtime(doc): Improve command-line completion docs (#13331)

* Improve command-line completion docs

Add more details about 'ignorecase' and its effect on cmdline
completion.

Make sure keys used in wildmenu are properly documented and linked in the
keys' documentation entries, and in `:h index` for proper
cross-referencing, as wildmenu popup is slightly different from
insert-mode popup menu.

* Fix docs typos

Signed-off-by: Christian Brabandt <cb@256bit.org>

1 files changed, 18 insertions, 7 deletions

diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index 9493658ed5..6d58d63873 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -90,9 +90,11 @@ CTRL-SHIFT-Q	Works just like CTRL-V, unless |modifyOtherKeys| is active,
 		In the GUI the |key-notation| is inserted without simplifying.
 
 							*c_<Left>* *c_Left*
-<Left>		cursor left
+<Left>		cursor left.  See 'wildmenu' for behavior during wildmenu
+		completion mode.
 							*c_<Right>* *c_Right*
-<Right>		cursor right
+<Right>		cursor right.  See 'wildmenu' for behavior during wildmenu
+		completion mode.
 							*c_<S-Left>*
 <S-Left> or <C-Left>					*c_<C-Left>*
 		cursor one WORD left
@@ -102,7 +104,8 @@ CTRL-SHIFT-Q	Works just like CTRL-V, unless |modifyOtherKeys| is active,
 CTRL-B or <Home>				*c_CTRL-B* *c_<Home>* *c_Home*
 		cursor to beginning of command-line
 CTRL-E or <End>					*c_CTRL-E* *c_<End>* *c_End*
-		cursor to end of command-line
+		cursor to end of command-line.  See 'wildmenu' for behavior
+		during wildmenu completion mode.
 
 							*c_<LeftMouse>*
 <LeftMouse>	Move the cursor to the position of the mouse click.
@@ -237,6 +240,7 @@ CTRL-\ e {expr}						*c_CTRL-\_e*
 CTRL-Y		When there is a modeless selection, copy the selection into
 		the clipboard. |modeless-selection|
 		If there is no selection CTRL-Y is inserted as a character.
+		See 'wildmenu' for behavior during wildmenu completion mode.
 
 CTRL-M or CTRL-J		*c_CTRL-M* *c_CTRL-J* *c_<NL>* *c_<CR>* *c_CR*
 <CR> or <NL>	start entered command
@@ -252,12 +256,14 @@ CTRL-C		quit command-line without executing
 
 							*c_<Up>* *c_Up*
 <Up>		recall older command-line from history, whose beginning
-		matches the current command-line (see below).
+		matches the current command-line (see below).  See 'wildmenu'
+		for behavior during wildmenu completion mode.
 		{not available when compiled without the |+cmdline_hist|
 		feature}
 							*c_<Down>* *c_Down*
 <Down>		recall more recent command-line from history, whose beginning
-		matches the current command-line (see below).
+		matches the current command-line (see below).  See 'wildmenu'
+		for behavior during wildmenu completion mode.
 		{not available when compiled without the |+cmdline_hist|
 		feature}
 
@@ -463,11 +469,16 @@ When repeating 'wildchar' or CTRL-N you cycle through the matches, eventually
 ending up back to what was typed.  If the first match is not what you wanted,
 you can use <S-Tab> or CTRL-P to go straight back to what you typed.
 
-The 'wildignorecase' option can be set to ignore case in filenames.
-
 The 'wildmenu' option can be set to show the matches just above the command
 line.
 
+The 'wildoptions' option provides additional configuration to use a popup menu
+for 'wildmenu', and to use fuzzy matching.
+
+The 'wildignorecase' option can be set to ignore case in filenames.  For
+completing other texts (e.g. command names), the 'ignorecase' option is used
+instead (fuzzy matching always ignores case, however).
+
 If you like tcsh's autolist completion, you can use this mapping:
 	:cnoremap X <C-L><C-D>
 (Where X is the command key to use, <C-L> is CTRL-L and <C-D> is CTRL-D)