Experimental Sixel support (#2544)

src/tui/tcell.go

@@ -203,6 +203,11 @@ func (r *FullscreenRenderer) Refresh() {
 	// noop
 }
 
+func (r *FullscreenRenderer) Size() (termSize, error) {
+	cols, lines := _screen.Size()
+	return termSize{lines, cols, 0, 0}, error("Not implemented")
+}
+
 func (r *FullscreenRenderer) GetChar() Event {
 	ev := _screen.PollEvent()
 	switch ev := ev.(type) {
@@ -541,6 +546,7 @@ func fill(x, y, w, h int, n ColorPair, r rune) {
 }
 
 func (w *TcellWindow) Erase() {
+	w.drawBorder(false)
 	fill(w.left-1, w.top, w.width+1, w.height-1, w.normal, ' ')
 }
 
@@ -692,6 +698,10 @@ func (w *TcellWindow) CFill(fg Color, bg Color, a Attr, str string) FillReturn {
 	return w.fillString(str, NewColorPair(fg, bg, a))
 }
 
+func (w *TcellWindow) DrawBorder() {
+	w.drawBorder(false)
+}
+
 func (w *TcellWindow) DrawHBorder() {
 	w.drawBorder(true)
 }