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Appends one mapped spoken-text run to a TPdfSpokenText chunk

Syntax

procedure SpokenTextAppend(var Spoken: TPdfSpokenText; const SpokenPart: WString; Page, StartIndex: Integer; SourceCount: Integer = -1);

Spoken	`TPdfSpokenText` - Chunk that receives the spoken text and span entry
SpokenPart	`WString` - Text run passed to the speech engine
Page	`Integer` - One-based source page number
StartIndex	`Integer` - Zero-based FTextPage source character index
SourceCount	`Integer` - Source character count, or -1 to use the spoken run length

SpokenTextAppend adds SpokenPart to Spoken.Text and records a TPdfSpokenSpan that maps the spoken offset back to page text

When Spoken.Text already has content the helper inserts one separator space before the new run; that separator is intentionally unmapped

API names, type names, file names, and PDF terms keep their original spelling so code search remains reliable
Use this helper when the spoken text is not the same as a raw page string, such as skipped regions, per-reading-unit chunks, or pronunciation overrides

Spoken.Text := '';
Spoken.Spans := nil;
SpokenTextAppend(Spoken, UnitText, 1, UnitStart, UnitLength);