Dragging in a text field now selects the dragged-over text

Note: Seems to need optimization, may not work when text overruns field boundaries

osx/dialogxml/field.cpp

@@ -114,6 +114,19 @@ bool cTextField::handleClick(location clickLoc) {
 	bool is_shift = sf::Keyboard::isKeyPressed(sf::Keyboard::LShift) || sf::Keyboard::isKeyPressed(sf::Keyboard::RShift);
 	set_ip(clickLoc, is_shift ? &cTextField::selectionPoint : &cTextField::insertionPoint);
 	if(!is_shift) selectionPoint = insertionPoint;
+	bool done = false;
+	sf::Event e;
+	while(!done) {
+		redraw();
+		if(!inWindow->pollEvent(e)) continue;
+		if(e.type == sf::Event::MouseButtonReleased){
+			done = true;
+		} else if(e.type == sf::Event::MouseMoved){
+			location newLoc(e.mouseMove.x, e.mouseMove.y);
+			set_ip(newLoc, &cTextField::selectionPoint);
+		}
+	}
+	redraw();
 	return true;
 }