Docs: ShowModal should document visible-window exception

Status: Fixed
Fixed in: v26.6.8
Source discussion: https://forum.objo.dev/d/469-doc-showmodal
Last updated: 2026-06-30

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Public summary

The Window.ShowModal documentation should state that calling ShowModal() on a window that is already visible raises InvalidArgumentException. The same note should cover ShowModal(owner) when the owner is not visible or when the window uses itself as its owner.