I am unable to vertically scroll a Vaadin Dialog containing a VerticalLayout taller than the screen when using a touchscreen device; the Dialog scrolls normally in a desktop environment using the mouse wheel.
This is the interested HTML:
<vaadin-dialog-overlay id="overlay" focus-trap="" with-backdrop="" opened="" role="dialog" style="z-index: 201;">
<flow-component-renderer appid="ROOT" nodeid="94" style="">
<div class="draggable" style="width: 100%; height: 100%;">
<vaadin-vertical-layout class="genericDialog" theme="padding spacing" style="width: 100%;">
<vaadin-horizontal-layout class="titleDialog" theme="spacing">
[stuff...]
</vaadin-horizontal-layout>
<vaadin-vertical-layout theme="padding spacing" style="width: 100%;">
[stuff...]
</vaadin-vertical-layout>
<vaadin-horizontal-layout class="buttonsDialog" theme="spacing">
[stuff...]
</vaadin-horizontal-layout>
</vaadin-vertical-layout>
</div>
</flow-component-renderer>
</vaadin-dialog-overlay>
The innermost <vaadin-vertical-layout>
is the element taller than the screen.
It turned out that it was indeed a bug in Vaadin 14.2.0. I updated Vaadin to 14.3.0 and now the dialog scroll works fine.