Add g_markup_escape_text to Glib

[olabiniV2]

No description provided.

[sqp]

Hey, yes unvalidated input has to be escaped before applying tags to use in gtk. (I'm applying the bold tag to the important parts I'm aware of for those who don't know that problem)

Here's what I'm using that seemed enough for now.

// Escape escapes a string to use as gtk text: &<>.
//
func Escape(msg string) string {
	msg = strings.Replace(msg, "&", "&amp;", -1) // Escape ampersand.
	msg = strings.Replace(msg, "<", "&lt;", -1)  // Escape <.
	msg = strings.Replace(msg, ">", "&gt;", -1)  // Escape >.
	return msg
}

If I have any issue with this some day, I might take the time to check the source to see what's more to do and complete it.

But that would be nice to make a complete go version if someone finds the motivation.