patch 9.1.0139: MS-Windows: ligatures map cleared on startup

Problem:  MS-Windows: ligatures map cleared on startup
Solution: Don't clear the ligatures_map, if the guiligatures
          option has already been set (Erik S. V. Jansson)

If guiligatures is set from a .vimrc it's possible
that it will be cleared on start-up (e.g. in Win32
that's what happens).

So don't clear the ligatures map if gui_set_ligatures()
has already been called (e.g. after setting 'ligatures'
from .vimrc)

closes: #14094

Signed-off-by: Erik S. V. Jansson <caffeineviking@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/gui.c

@@ -456,6 +456,10 @@ gui_init_check(void)
     gui.prev_wrap = -1;
 
 #if defined(FEAT_GUI_GTK) || defined(FEAT_GUI_MSWIN)
+    // Note: gui_set_ligatures() might already have been called e.g. from .vimrc,
+    // and in that case we don't want to overwrite ligatures map that has already
+    // been correctly populated (as that would lead to a cleared ligatures maps).
+    if (*p_guiligatures == NUL)
         CLEAR_FIELD(gui.ligatures_map);
 #endif
 

src/optionstr.c

@@ -4530,7 +4530,7 @@ did_set_string_option(
 		|| varp == &p_guifontset	// 'guifontset'
 # endif
 		|| varp == &p_guifontwide	// 'guifontwide'
-# ifdef FEAT_GUI_GTK
+# if defined(FEAT_GUI_GTK) || defined(FEAT_GUI_MSWIN)
 		|| varp == &p_guiligatures	// 'guiligatures'
 # endif
 	    )

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    139,
 /**/
     138,
 /**/