Modal action buttons now stay in view

In dialogs with a lot of content, the action buttons at the bottom now stay pinned in place instead of scrolling out of view.

We fixed how buttons behave in pop-up windows. When a dialog had more content than fit on the screen, its action buttons — such as Cancel and Confirm — used to scroll away with the rest of the content, forcing you to scroll all the way to the bottom to use them.

Now those buttons stay pinned to the bottom of the window while the content scrolls behind them, so they are always within reach. This applies across the app wherever dialogs are used.