Handle hidden text - #243
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Detect text painted with render mode 3 or 7, or near-zero opacity, as invisible (previously only render mode 3). Always emit INVISIBLE="true" on such tokens so consumers can filter hidden text (white-on-white is already exposed via FONTCOLOR). Add -removeHiddenText: drop hidden tokens (invisible or white) that are not positioned over a page image, while keeping genuine OCR text layers (text over an image). Addresses GROBID issues #826 and #1083.
Capture the per-glyph fill/stroke constant opacity (already computed but previously discarded) and emit OPACITY="<value>" on <String> tokens that are not fully opaque, keeping FONTCOLOR as standard #RRGGBB. Fully transparent text (opacity 0) is still reported via INVISIBLE. Addresses pdfalto issue #82. Also complete the render-mode-7 invisibility check in drawChar; the earlier change had only covered the drawString path.
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TBA