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++ {
mainc, combc, style, width := s.GetContent(col, row)
if style == tcell.StyleDefault {
style = defStyle
}
style = style.Reverse(sel)
s.SetContent(col, row, mainc, combc, style)
col += width - 1
}
}
}
