Rewrite of the editbox widget. Binary layout and public API unchanged.
- much more readable code
- scroll step = actual chars that fit in the field (`visibleCount`, ex-`shift_old`), not hardcoded 8 (fixes#652)
- `edit_box` formalized as a fasm `struct` with named fields; unions add readable aliases (`caretPos`, `textLen`, `selectColor`, ...) to the old names
- `txCol` -> `txColor` (`BColor` union with per-channel access)
- clipboard: payload described by `BClipBuf` struct, content validated before paste, fixed paste arithmetic and a memory leak on read
- restored Ctrl+C
- fixed `not cx` truncation (buffer overflow), stale redraw in insert mode, division with uninitialized edx
- control flow untangled into procedures, net -94 lines
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Co-authored-by: Burer <burer@kolibrios.org>
Co-authored-by: ZReticules <my_mailbox_228@mail.ru>
Reviewed-on: KolibriOS/kolibrios#662
Reviewed-by: IgorA <22+igora@noreply.localhost>
Reviewed-by: Mikhail Frolov <mixa.frolov2003@gmail.com>
Reviewed-by: Burer <burer@kolibrios.org>
Co-authored-by: The Bird of Hermes <zlo.shustrik@mail.ru>
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