X11: Disable menucolors when showing text files

include/winX.h

@@ -165,6 +165,7 @@ struct menu_info_t {
     boolean cancelled; /* Menu has been explicitly cancelled. */
     boolean counting;  /* true when menu_count has a valid value */
     boolean permi;
+    boolean disable_mcolors; /* disable menucolors */
 
     int permi_x, permi_y; /* perm_invent window x,y */
     int permi_w, permi_h; /* perm_invent window wid, hei */

win/X11/winX.c

@@ -1962,6 +1962,7 @@ boolean complain;
         wp->title = dupstr(str);
 
     wp->menu_information->permi = FALSE;
+    wp->menu_information->disable_mcolors = TRUE;
     (void) X11_select_menu(newwin, PICK_NONE, &menu_list);
     X11_destroy_nhwindow(newwin);
 }

win/X11/winmenu.c

@@ -1162,7 +1162,7 @@ struct menu *curr_menu;
         XtSetArg(args[num_args], nhStr(XtNborderWidth), 0); num_args++;
         XtSetArg(args[num_args], nhStr(XtNvertDistance), 0); num_args++;
 
-        if (!iflags.use_menu_color
+        if (!iflags.use_menu_color || wp->menu_information->disable_mcolors
             || !get_menu_coloring(curr->str, &color, &attr))
             attr = curr->attr;