patch 9.1.1865: tests: do not notice lines containing only a tab

Problem:  tests: test_codestyle does not notice lines containing only a
          tab
Solution: Fix the whitespace issue in eval.txt, update test_codestyle to
          notice such issues (Hirohito Higashi)

closes: #18595

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 9.1.  Last change: 2025 Oct 16
+*eval.txt*	For Vim version 9.1.  Last change: 2025 Oct 18
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5356,30 +5356,30 @@ OSC52 command: >vim
 	func Available()
 	  return "*"
 	endfunc
-	
+
 	func Paste(reg, type)
 	  " If implicit access, don't do anything
 	  if a:type == "implicit"
 	    return "previous"
 	  endif
-	
+
 	  augroup OSC
 	    autocmd!
 	    autocmd TermResponseAll osc ++once call feedkeys("\<F30>", '!')
 	  augroup END
-	
+
 	  " Send command
 	  call echoraw("\<Esc>]52;;?\<Esc>\\")
-	
+
 	  " Wait until autocmd is triggered
 	  while getchar(-1) != "\<F30>"
 	  endwhile
-	
+
 	  autocmd! OSC
-	
+
 	  " Extract the base64 stuff
 	  let l:stuff = matchstr(v:termosc, '52;.\+;\zs[A-Za-z0-9+/=]\+')
-	
+
 	  return ("", blob2str(base64_decode(l:stuff)))
 	endfunc
 

src/testdir/test_codestyle.vim

@@ -137,7 +137,7 @@ def Test_help_files()
     # Check for unnecessary whitespace at the end of a line
     cursor(1, 1)
     while 1
-      lnum = search('[^/~\\]\s$')
+      lnum = search('\%([^/~\\]\|^\)\s\+$')
       # skip line that are known to have trailing white space
       if fname == 'map.txt' && getline(lnum) =~ "unmap @@ $"
         || fname == 'usr_12.txt' && getline(lnum) =~ "^\t/ \t$"

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1865,
 /**/
     1864,
 /**/