Prevent caption selection from scrolling screen

[tomdav999]

If you try to select the caption with the mouse, touchscreen, etc. it scrolls the screen. To prevent this I made the following change in photoswipe.js:

code revised below

[tomdav999]

Actually, to allow text selection via drag in chrome you need to make the changes at the top of the function before preventDefault();

    // Pointermove/touchmove/mousemove handler
    _onDragMove = function(e) {

    // add these 7 lines below before e.preventDefault();
    var el = document.elementFromPoint(_currPoint.x, _currPoint.y);
    while (el && !el.className) {
        el = el.parentElement;
    }
    if (el.className.indexOf('__caption') > -1) {
                return;
        }
    // add these 7 lines above before e.preventDefault();
    e.preventDefault();

[tomdav999]

One more tweak is needed (to prevent pswp from zooming when drag is released outside of caption). Setting _moved = true; seems to do the trick. Edit: whoops, setting _moved = true; prevented drag inside caption in desktop Chrome. Setting _mainScrollAnimating = true; seems to work better.

if (el.className.indexOf('__caption') > -1) {
    _mainScrollAnimating = true; // prevent photoswipe default tap event when drag released outside caption
    return; // to allow drag select inside caption don't call e.preventDefault();
}