patch 9.0.1232: ColorTable saving and restoring does not work properly

Problem:    ColorTable saving and restoring does not work properly.
Solution:   Restore ColorTable[16] usage. (Christopher Plewright,
            closes #11836)

src/os_win32.c

@@ -3426,7 +3426,6 @@ mch_init_c(void)
 
     wt_init();
     vtp_flag_init();
-    vtp_init();
 # ifdef FEAT_RESTORE_ORIG_SCREEN
     // Save the initial console buffer for later restoration
     SaveConsoleBuffer(&g_cbOrig);
@@ -3463,6 +3462,8 @@ mch_init_c(void)
 
     ui_get_shellsize();
 
+    vtp_init();
+
 # ifdef MCH_WRITE_DUMP
     fdDump = fopen("dump", "wt");
 
@@ -8456,8 +8457,6 @@ vtp_flag_init(void)
 vtp_init(void)
 {
 # ifdef FEAT_TERMGUICOLORS
-    if (!vtp_working)
-    {
     CONSOLE_SCREEN_BUFFER_INFOEX csbi;
     csbi.cbSize = sizeof(csbi);
     GetConsoleScreenBufferInfoEx(g_hConOut, &csbi);
@@ -8475,7 +8474,6 @@ vtp_init(void)
     fg = (COLORREF)csbi.ColorTable[g_color_index_fg];
     fg = (GetRValue(fg) << 16) | (GetGValue(fg) << 8) | GetBValue(fg);
     default_console_color_fg = fg;
-    }
 # endif
     use_alternate_screen_buffer = win10_22H2_or_later && p_rs && vtp_working
 						&& !mch_getenv("VIM_TERMINAL");
@@ -8667,6 +8665,12 @@ wt_init(void)
     wt_working = mch_getenv("WT_SESSION") != NULL;
 }
 
+    int
+use_wt(void)
+{
+    return USE_WT;
+}
+
 # ifdef FEAT_TERMGUICOLORS
     static int
 ctermtoxterm(
@@ -8699,8 +8703,6 @@ set_console_color_rgb(void)
 	return;
     }
 
-    if (!conpty_working)
-    {
     fg = (GetRValue(fg) << 16) | (GetGValue(fg) << 8) | GetBValue(fg);
     bg = (GetRValue(bg) << 16) | (GetGValue(bg) << 8) | GetBValue(bg);
 
@@ -8715,7 +8717,6 @@ set_console_color_rgb(void)
     csbi.ColorTable[g_color_index_bg] = (COLORREF)bg;
     csbi.ColorTable[g_color_index_fg] = (COLORREF)fg;
     SetConsoleScreenBufferInfoEx(g_hConOut, &csbi);
-    }
 # endif
 }
 
@@ -8742,40 +8743,25 @@ get_default_console_color(
 	ctermfg = -1;
 	if (id > 0)
 	    syn_id2cterm_bg(id, &ctermfg, &dummynull);
-	if (vtp_working)
-	{
-	    cterm_normal_fg_gui_color = guifg =
-			    ctermfg != -1 ? ctermtoxterm(ctermfg) : INVALCOLOR;
-	    ctermfg = ctermfg < 0 ? 0 : ctermfg;
-	}
+	if (ctermfg != -1)
+	    guifg = ctermtoxterm(ctermfg);
 	else
-	{
-	    guifg = ctermfg != -1 ? ctermtoxterm(ctermfg)
-						    : default_console_color_fg;
+	    guifg = USE_WT ? INVALCOLOR : default_console_color_fg;
 	cterm_normal_fg_gui_color = guifg;
 	ctermfg = ctermfg < 0 ? 0 : ctermfg;
     }
-    }
     if (guibg == INVALCOLOR)
     {
 	ctermbg = -1;
 	if (id > 0)
 	    syn_id2cterm_bg(id, &dummynull, &ctermbg);
-	if (vtp_working)
-	{
-	    cterm_normal_bg_gui_color = guibg =
-			    ctermbg != -1 ? ctermtoxterm(ctermbg) : INVALCOLOR;
-	    if (ctermbg < 0)
-		ctermbg = 0;
-	}
+	if (ctermbg != -1)
+	    guibg = ctermtoxterm(ctermbg);
 	else
-	{
-	    guibg = ctermbg != -1 ? ctermtoxterm(ctermbg)
-						    : default_console_color_bg;
+	    guibg = USE_WT ? INVALCOLOR : default_console_color_bg;
 	cterm_normal_bg_gui_color = guibg;
 	ctermbg = ctermbg < 0 ? 0 : ctermbg;
     }
-    }
 
     *cterm_fg = ctermfg;
     *cterm_bg = ctermbg;
@@ -8792,9 +8778,6 @@ reset_console_color_rgb(void)
 {
 # ifdef FEAT_TERMGUICOLORS
 
-    if (vtp_working)
-	return;
-
     CONSOLE_SCREEN_BUFFER_INFOEX csbi;
 
     csbi.cbSize = sizeof(csbi);
@@ -8816,8 +8799,6 @@ reset_console_color_rgb(void)
 restore_console_color_rgb(void)
 {
 # ifdef FEAT_TERMGUICOLORS
-    if (vtp_working)
-	return;
 
     CONSOLE_SCREEN_BUFFER_INFOEX csbi;
 

src/proto/os_win32.pro

@@ -73,6 +73,7 @@ void set_alist_count(void);
 void fix_arg_enc(void);
 int mch_setenv(char *var, char *value, int x);
 int vtp_printf(char *format, ...);
+int use_wt(void);
 void get_default_console_color(int *cterm_fg, int *cterm_bg, guicolor_T *gui_fg, guicolor_T *gui_bg);
 void control_console_color_rgb(void);
 int use_vtp(void);

src/term.c

@@ -3222,7 +3222,7 @@ term_rgb_color(char_u *s, guicolor_T rgb)
     vim_snprintf(buf, MAX_COLOR_STR_LEN,
 				  (char *)s, RED(rgb), GREEN(rgb), BLUE(rgb));
 #ifdef FEAT_VTP
-    if (has_vtp_working())
+    if (use_wt())
     {
 	out_flush();
 	buf[1] = '[';

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1232,
 /**/
     1231,
 /**/