Function read_text 

pub async fn read_text(
    pool: &PgPool,
    actor: &Actor,
    revision_id: Uuid,
    filename: &str,
    version: Option<i32>,
    offset: i64,
    limit: i64,
) -> AppResult<FileText>

Reads a page (offset, at most limit characters, capped at MAX_TEXT_PAGE_CHARS) of the extracted text of a file of a revision (version: default the current one). Hidden project groups answer like a missing revision; nothing is read from the vault, only the text the upload stored for the search.