Hi there, I'm trying to fix some corner cases in LilyPond's Cairo support. For proper copy&paste support in our PDF output (https://gitlab.com/lilypond/lilypond/-/issues/6172), I'm trying to use cairo_show_text_glyphs(). This seems to mostly work in normal cases. However, when rendering bidi text in Pango, the direction changing codes (U+202A, U+202B, U+202C) generate a cluster entry in Pango, but the glyph is invisible.
Currently, LilyPond simply filters out the invisible glyph, but with cairo_show_text_glyphs that causes the UTF-8 text, glyph list and cluster mapping to go out of sync, leading to 'input clusters do not represent the accompanying text and glyph arrays' Is there a standard way to specify an invisible glyph to cairo_show_text_glyphs? I'd rather not have to edit the UTF-8 string to filter out the invisible chars. -- Han-Wen Nienhuys - hanw...@gmail.com - http://www.xs4all.nl/~hanwen