gtk:entry-invisible-char (object)

object -- a gtk:entry widget
char -- an unsigned integer for a Unicode char code

The accessor for the invisible-char slot of the gtk:entry class gets or sets the invisible character used when masking the text entry contents in "password mode".

For example, this is the character used in "password mode" to show the user how many characters have been typed. By default, GTK picks the best invisible char available in the current font. If you set the invisible char to 0, then the user will get no feedback at all. There will be no text on the screen as they type.