pub fn invalidate(&self) {
        self.show();
        /* ////
            if let Some(state) = self.state.upgrade() {
                state.window.queue_draw();
            }
        */ ////
    }
// Request invalidation of the entire window contents.
Request invalidation of the entire window contents.
Request invalidation of the entire window contents .
pub fn invalidate(&self) {
        self.show();
        /* ////
            if let Some(state) = self.state.upgrade() {
                state.window.queue_draw();
            }
        */ ////
    }
pub fn invalidate ( & self ) { self . show ( ) ; /* ////
            if let Some(state) = self.state.upgrade() {
                state.window.queue_draw();
            }
        */ //// }
Request invalidation of the entire window contents.
Request invalidation of the entire window contents .
&self
&self