Update ANSI processor to ignore ^N and ^O

This reverts commit 02c6ad0e59.

src/ansi.go

@@ -35,7 +35,7 @@ func (s *ansiState) equals(t *ansiState) bool {
 var ansiRegex *regexp.Regexp
 
 func init() {
-	ansiRegex = regexp.MustCompile("\x1b.[0-9;]*.")
+	ansiRegex = regexp.MustCompile("\x1b\\[[0-9;]*.|[\x0e\x0f]")
 }
 
 func extractColor(str string, state *ansiState, proc func(string, *ansiState) bool) (string, *[]ansiOffset, *ansiState) {
@@ -100,7 +100,7 @@ func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
 	} else {
 		state = &ansiState{prevState.fg, prevState.bg, prevState.attr}
 	}
-	if ansiCode[1] != '[' || ansiCode[len(ansiCode)-1] != 'm' {
+	if ansiCode[0] != '\x1b' || ansiCode[len(ansiCode)-1] != 'm' {
 		return state
 	}
 

src/curses/curses.go

@@ -682,13 +682,7 @@ func (w *Window) Erase() {
 }
 
 func (w *Window) Fill(str string) bool {
-	return C.waddstr(w.win, C.CString(strings.Map(func(r rune) rune {
-		// Remove ^N and ^O (set and unset altcharset)
-		if r == 14 || r == 15 {
-			return -1
-		}
-		return r
-	}, str))) == C.OK
+	return C.waddstr(w.win, C.CString(str)) == C.OK
 }
 
 func (w *Window) CFill(str string, fg int, bg int, a Attr) bool {