Add option to keep Dialog within viewport when dragging

[sissbruecker]

Describe your motivation

When using a draggable dialog, users can drag it outside the viewport bounds, making part of the dialog inaccessible. There's no way to constrain the dialog to stay within the visible area.

Describe the solution you'd like

Add a property that allows to restrain the dialog to the viewport, so that all four edges of the dialog remain visible during dragging.

Describe alternatives you've considered

No response

Additional context

No response