vim-patch:8.2.0047: cannot skip tests for specific MS-Windows platform (#13461)

Problem:    Cannot skip tests for specific MS-Windows platform.
Solution:   Add windowsversion().
0c1e3744ff

src/nvim/eval.lua

@@ -392,6 +392,7 @@ return {
     win_screenpos={args=1},
     winbufnr={args=1},
     wincol={},
+    windowsversion={},
     winheight={args=1},
     winlayout={args={0, 1}},
     winline={},

src/nvim/eval/funcs.c

@@ -11213,6 +11213,13 @@ static void f_winwidth(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   }
 }
 
+// "windowsversion()" function
+static void f_windowsversion(typval_T *argvars, typval_T *rettv, FunPtr fptr)
+{
+  rettv->v_type = VAR_STRING;
+  rettv->vval.v_string = (char_u *)xstrdup(windowsVersion);
+}
+
 /// "wordcount()" function
 static void f_wordcount(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 {

src/nvim/globals.h

@@ -1052,4 +1052,7 @@ typedef enum {
 #define MIN_CD_SCOPE  kCdScopeWindow
 #define MAX_CD_SCOPE  kCdScopeGlobal
 
+// Only filled for Win32.
+EXTERN char windowsVersion[20] INIT(= { 0 });
+
 #endif  // NVIM_GLOBALS_H

src/nvim/main.c

@@ -169,6 +169,14 @@ void early_init(mparm_T *paramp)
   init_normal_cmds();   // Init the table of Normal mode commands.
   highlight_init();
 
+#ifdef WIN32
+  OSVERSIONINFO ovi;
+  ovi.dwOSVersionInfoSize = sizeof(ovi);
+  GetVersionEx(&ovi);
+  snprintf(windowsVersion, sizeof(windowsVersion), "%d.%d",
+           (int)ovi.dwMajorVersion, (int)ovi.dwMinorVersion);
+#endif
+
 #if defined(HAVE_LOCALE_H)
   // Setup to use the current locale (for ctype() and many other things).
   // NOTE: Translated messages with encodings other than latin1 will not

src/nvim/testdir/test_options.vim

@@ -348,6 +348,16 @@ func Test_set_values()
   endif
 endfunc
 
+func Test_renderoptions()
+  throw 'skipped: Nvim does not support renderoptions'
+  " Only do this for Windows Vista and later, fails on Windows XP and earlier.
+  " Doesn't hurt to do this on a non-Windows system.
+  if windowsversion() !~ '^[345]\.'
+    set renderoptions=type:directx
+    set rop=type:directx
+  endif
+endfunc
+
 func ResetIndentexpr()
   set indentexpr=
 endfunc