patch 8.2.4903: cannot get the current cmdline completion type and position

Problem:    Cannot get the current cmdline completion type and position.
Solution:   Add getcmdcompltype() and getcmdscreenpos(). (Shougo Matsushita,
            closes #10344)

runtime/doc/builtin.txt

@@ -213,8 +213,12 @@ getcharmod()			Number	modifiers for the last typed character
 getcharpos({expr})		List	position of cursor, mark, etc.
 getcharsearch()			Dict	last character search
 getcharstr([expr])		String	get one character from the user
+getcmdcompltype()		String	return the type of the current
+					command-line completion
 getcmdline()			String	return the current command-line
 getcmdpos()			Number	return cursor position in command-line
+getcmdscreenpos()		Number	return cursor screen position in
+					command-line
 getcmdtype()			String	return current command-line type
 getcmdwintype()			String	return current command-line window type
 getcompletion({pat}, {type} [, {filtered}])
@@ -3208,6 +3212,13 @@ getcharstr([expr])					*getcharstr()*
 		Otherwise this works like |getchar()|, except that a number
 		result is converted to a string.
 
+getcmdcompltype()					*getcmdcompltype()*
+		Return the type of the current command-line completion.
+		Only works when the command line is being edited, thus
+		requires use of |c_CTRL-\_e| or |c_CTRL-R_=|.
+		See |command-completion| for the return string.
+		Also see |getcmdtype()|, |setcmdpos()| and |getcmdline()|.
+		Returns an empty string when completion is not defined.
 
 getcmdline()						*getcmdline()*
 		Return the current command-line.  Only works when the command
@@ -3227,6 +3238,15 @@ getcmdpos()						*getcmdpos()*
 		Returns 0 otherwise.
 		Also see |getcmdtype()|, |setcmdpos()| and |getcmdline()|.
 
+getcmdscreenpos()					*getcmdscreenpos()*
+		Return the screen position of the cursor in the command line
+		as a byte count.  The first column is 1.
+		Instead of |getcmdpos()|, it adds the prompt position.
+		Only works when editing the command line, thus requires use of
+		|c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
+		Returns 0 otherwise.
+		Also see |getcmdpos()|, |setcmdpos()|.
+
 getcmdtype()						*getcmdtype()*
 		Return the current command-line type. Possible return values
 		are:

runtime/doc/usr_41.txt

@@ -976,8 +976,12 @@ Buffers, windows and the argument list:
 	swapname()		get the swap file path of a buffer
 
 Command line:					*command-line-functions*
+	getcmdcompltype()	get the type of the current command line
+				completion
 	getcmdline()		get the current command line
 	getcmdpos()		get position of the cursor in the command line
+	getcmdscreenpos()	get screen position of the cursor in the
+				command line
 	setcmdpos()		set position of the cursor in the command line
 	getcmdtype()		return the current command-line type
 	getcmdwintype()		return the current command-line window type