bringToFront method
Brings the given window to the front of all windows.
Implementation
void bringToFront(Window win) {
if (windows.isEmpty) return;
var maxZ = win.zIndex;
for (final other in windows) {
if (other != win && other.zIndex > maxZ) {
maxZ = other.zIndex;
}
}
if (win.zIndex <= maxZ) {
win.zIndex = maxZ + 1;
}
}