Honor selectionColor.alphaFloat when drawing selection boxes in FlxInputText

[DetectiveBaldi]

Recently I was working on a search engine using the new input text component, and modified the selection color to the value seen in Chrome browsers. I realized though that this color contrasted very poorly at 100% alpha, and from what I can tell there is no way to change it currently.

Simple test case:

package;

import flixel.FlxSprite;
import flixel.util.FlxColor;
import flixel.FlxG;
import flixel.text.FlxInputText;
import flixel.FlxState;

class PlayState extends FlxState
{
	override public function create()
	{
		super.create();

		camera.bgColor = FlxColor.WHITE;

		var bg:FlxSprite = new FlxSprite().makeGraphic(FlxG.width, 44, FlxColor.RED);
		bg.screenCenter();
		add(bg);

		var text:FlxInputText = new FlxInputText(0.0, 0.0, FlxG.width, "", 32, FlxColor.BLACK, FlxColor.TRANSPARENT);
		text.color = FlxColor.WHITE;
		text.text = "Hello!";
		// 0.3 alpha
		text.selectionColor = 0x4D0074FF;
		text.screenCenter();
		add(text);
	}
}

Before:

After:

Although color alpha isn't typically honored with FlxSprites (not really sure why this is the case either), I think it would make much more sense to make color alpha valid here instead of creating a whole new selectionAlpha field or something along those lines.