Fix or add an option to ff-dialog for dialogs containing a dropdown

[Pezmc]

Story

No response

Description

Since https://github.com/flowforge/flowforge/pull/1201 introduced ff-dropdowns as part of FormRows (instead of native selects), all ff-dialogs containing selects now cause the ff-dialog to scroll, rather than the form options pop-out.

FlowForge has been fixing this by manually overriding the overflow setting for dialogues containing just a dropdown, but a more universal fix; or a flag property to enable "no-scroll" should be added to ff-dialog.

Ideally, the dropdown options should be using absolute positioning so they're not considered part of the document flow, but for a reason I haven't fully wrapped my head around yet, this isn't working.

Example:

• https://github.com/flowforge/flowforge/pull/1294
• https://github.com/flowforge/flowforge/pull/1257
• https://github.com/flowforge/flowforge/pull/1306

[Pezmc]

Also seen in the create stacks dialog, which usually scrolls.

And add device to project: