The WhatsNewDialog still has problems with different screen sizes. Some of my customers have reported that the OK / Cancel buttons can completely disappear off the bottom of the form and the RTF/Memo can be wider than the form depending on their screen resolution / scaling. I found that the following code after the buttons have been created and positioned and just before the ShowModal (in TWebUpdate.WhatsNewDialog) helps:
form.ClientWidth := ctrlwidth + 20;
form.ClientHeight := ctrlheight + ctrltop + round(Cancel.Height * 1.25) + 20;
It's not perfect, the button height changes depending in the screen resolution so the space below the button varies, but it does seem to work much better than the current code.
