patch 9.2.0416: Unix: filename completion splits at space for single-file Ex commands

Problem:  SPACE_IN_FILENAME is defined on most platforms but not on Unix.
	  As a result, set_context_for_wildcard_arg() on Unix always resets the
	  completion pattern at white space for Ex commands that take a
          single file argument.
Solution: Drop the SPACE_IN_FILENAME ifdef (Maxim Kim)

fixes:  #18411
closes: #20090

Signed-off-by: Maxim Kim <habamax@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/todo.txt

@@ -1,4 +1,4 @@
-*todo.txt*	For Vim version 9.2.  Last change: 2026 Feb 14
+*todo.txt*	For Vim version 9.2.  Last change: 2026 Apr 29
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -421,8 +421,6 @@ more information.
 
 Add an option to restrict 'incsearch' to not scroll the view. (Tavis Ormandy)
 
-Remove SPACE_IN_FILENAME ? It is only used for completion.
-
 When 'term' starts with "foot" then default t_TI and t_TE to the values used
 for the builtin xterm termcap.
 

runtime/doc/version9.txt

@@ -52642,6 +52642,9 @@ Changed ~
 - Removed the Wayland focus steal feature 'wlsteal', since it causes too many
   issues and can now be re-implemted using the |clipboard-providers| feature
   if needed, see |wayland-primary-selection| for an example.
+- On Unix, filename completion for single-file Ex commands now treats embedded
+  whitespace as part of the filename, like on other platforms.
+
 
 							*added-9.3*
 Added ~

src/cmdexpand.c

@@ -1832,9 +1832,7 @@ set_context_for_wildcard_arg(
 	// An argument can contain just about everything, except
 	// characters that end the command and white space.
 	else if (c == '|' || c == '\n' || c == '"' || (VIM_ISWHITE(c)
-#ifdef SPACE_IN_FILENAME
 		    && (!(eap != NULL && (eap->argt & EX_NOSPC)) || usefilter)
-#endif
 		    ))
 	{
 	    len = 0;  // avoid getting stuck when space is in 'isfname'

src/os_amiga.h

@@ -11,7 +11,6 @@
  */
 
 #define CASE_INSENSITIVE_FILENAME   // ignore case when comparing file names
-#define SPACE_IN_FILENAME
 #define USE_FNAME_CASE		    // adjust case of file names
 #define USE_TERM_CONSOLE
 #define HAVE_AVAIL_MEM

src/os_dos.h

@@ -109,7 +109,6 @@
 #define CLEAN_RUNTIMEPATH	"$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after"
 
 #define CASE_INSENSITIVE_FILENAME   // ignore case when comparing file names
-#define SPACE_IN_FILENAME
 #define BACKSLASH_IN_FILENAME
 #define USE_CRNL		// lines end in CR-NL instead of NL
 #define HAVE_DUP		// have dup()

src/os_mac.h

@@ -74,7 +74,6 @@
 
 #define USE_EXE_NAME		    // to find  $VIM
 #define CASE_INSENSITIVE_FILENAME   // ignore case when comparing file names
-#define SPACE_IN_FILENAME
 
 #define USE_FNAME_CASE		// make ":e os_Mac.c" open the file in its
 				// original case, as "os_mac.c"

src/os_vms_conf.h

@@ -12,7 +12,6 @@
 #include <decc$types.h>             // Required early for large-file support
 
 #define CASE_INSENSITIVE_FILENAME   // Open VMS is case insensitive
-#define SPACE_IN_FILENAME           // There could be space between user and passwd
 #define FNAME_ILLEGAL "|*#?%"       // Illegal characters in a file name
 #define BINARY_FILE_IO              // Use binary fileio
 #define USE_GETCWD

src/testdir/test_cmdline.vim

@@ -5400,4 +5400,20 @@ func Test_rulerformat_empty()
   set rulerformat&
 endfunc
 
+func Test_cmdline_complete_with_space()
+  call mkdir('Xspc', 'R')
+  let save_cwd = getcwd()
+  cd Xspc
+  call writefile([], 'foo bar')
+  call writefile([], 'baz')
+  call writefile([], 'bz')
+
+  " This should expand to foo\ bar, not add 3 space separated
+  " files: foo baz bz
+  call feedkeys(":badd foo b\<C-A>\<C-B>\"\<CR>", 'xt')
+  call assert_equal('"badd foo\ bar', @:)
+
+  call chdir(save_cwd)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    416,
 /**/
     415,
 /**/