Selecting a variant from the Hold-Enter accent popup (e.g. 'o' -> 'o with
acute') correctly stored the real UTF-8 character in the text buffer, but
the live-typing preview line rendered it as the plain base letter -- the
accent was invisible even though the data was right.
Root cause: DisplayDriver::translateUTF8ToBlocks() transliterates extended
Latin characters down to ASCII for display drivers whose font can't render
them; real boards with the pixel-perfect MiscFixedFont override it to a
plain passthrough once _single_font is set (SH1106Display.cpp etc).
SimDisplayDriverCanvas reuses that same MiscFixedFont/MiscFixedRenderer
(confirmed the popup's own preview renders diacritics correctly, since it
prints its own variants directly rather than through this path) but never
added the matching override, so every string routed through
translateUTF8ToBlocks() -- not just the keyboard preview -- silently lost
its diacritics.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
JakubandClaude Sonnet 5
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