add ESCAPE_NOBOLD (sgr22) to avoid sgr0 #1818

src/lib/termdesc.c

@@ -464,13 +464,16 @@ int interrogate_terminfo(tinfo* ti, int fd, const char* termname, unsigned utf8,
     unsigned ncvbit;   // bit in "ncv" mask for unconditional deny
   } styles[] = {
     { NCSTYLE_BOLD, "bold", A_BOLD },
-    { NCSTYLE_REVERSE, "rev", A_REVERSE },
     { NCSTYLE_UNDERLINE, "smul", A_UNDERLINE },
-    { NCSTYLE_DIM, "dim", A_DIM },
     { NCSTYLE_ITALIC, "sitm", A_ITALIC },
     { NCSTYLE_STRUCK, "smxx", 0 },
     { 0, NULL, 0 }
   };
+  if(get_escape(ti, ESCAPE_BOLD) == NULL){
+    if(grow_esc_table(ti, "\e[22m", ESCAPE_NOBOLD, &tablelen, &tableused)){
+      goto err;
+    }
+  }
   const char* sgr = get_escape(ti, ESCAPE_SGR);
   int nocolor_stylemask = tigetnum("ncv");
   for(typeof(*styles)* s = styles ; s->s ; ++s){

src/lib/termdesc.h

@@ -45,6 +45,7 @@ typedef enum {
   ESCAPE_CUB,      // "cub" move n cells back (left)
   ESCAPE_CUF,      // "cuf" move n cells forward (right)
   ESCAPE_BOLD,     // "bold" enter bold mode
+  ESCAPE_NOBOLD,   // disable bold (ANSI but not terminfo, SGR 22)
   ESCAPE_CUD,      // "cud" move n cells down
   ESCAPE_CUF1,     // "cuf1" move 1 cell forward (right)
   ESCAPE_SMKX,     // "smkx" keypad_xmit (keypad transmit mode)