- Selections are character ranges backed by pdfium character boxes,
fetched per page on demand and cached, so a drag stops mid-word and
copy yields the exact substring.
- Double clicks select the word under the pointer and right clicks
outside the selection select the word before opening the context menu.
- Highlight runs merge neighbouring characters on a line, keeping the
painted quad count low, and margins clicks resolve to the nearest glyph.
- Saving a copy of the document is available from the toolbar, the
context menu, and ctrl-s; picking the opened file itself is a no-op.
yenru0
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