Properly clear syntax highlighting when it is disabled

cmd/micro/buffer.go

@@ -467,3 +467,11 @@ func (b *Buffer) MoveLinesDown(start int, end int) {
 		Loc{0, end + 1},
 	)
 }
+
+// ClearMatches clears all of the syntax highlighting for this buffer
+func (b *Buffer) ClearMatches() {
+	for i := range b.lines {
+		b.SetMatch(i, nil)
+		b.SetState(i, nil)
+	}
+}

cmd/micro/settings.go

@@ -345,6 +345,14 @@ func SetLocalOption(option, value string, view *View) error {
 		buf.UpdateRules()
 	}
 
+	if option == "syntax" {
+		if !nativeValue.(bool) {
+			buf.ClearMatches()
+		} else {
+			buf.highlighter.Highlight(buf, 0)
+		}
+	}
+
 	return nil
 }