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d60b0c70b4
Avoid lossy Latin-1 conversions when creating/looking up Qt HighGUI windows and convert C-string entry points to UTF-8 explicitly. This fixes non-ASCII title handling paths that could lead to mismatched window lookup and silent display failures. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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