func drawSelect(s tcell.Screen, x1, y1, x2, y2 int, sel bool) {
if y2 < y1 {
y1, y2 = y2, y1
}
if x2 < x1 {
x1, x2 = x2, x1
}
for row := y1; row <= y2; row++ {
for col := x1; col <= x2; col++ {
if cp := s.GetCell(col, row); cp != nil {
st := cp.Style
if st == tcell.StyleDefault {
st = defStyle
}
st = st.Reverse(sel)
cp.Style = st
s.PutCell(col, row, cp)
}
}
}
}
