This commit adds an `--laparams` flag to the pdfplumber CLI, giving it
more feature parity with the core library. To do so, it makes some
internal changes to `convert.py`, including changing the list of objects
to convert from *a predefined default list* to *all types extracted*.
pdfminer.six's `LTAnno` objects are not PDF annotations (which we
already provide access to via `.annots`, regardless of whether
`laparams` is set), but rather layout annotations. Per pdfminer.six
codebase:
> Note that, while a LTChar object has actual boundaries, LTAnno objects
> does not, as these are "virtual" characters, inserted by a layout
> analyzer according to the relationship between two characters (e.g. a
> space).
Because they have no boundaries, they cause problems for pdfplumber,
which expects bounding-box coordinates for all objects. See, e.g.,
issue #383, which this commit should fix.
This commit reinstates access to higher-level layout objects (such as
`textboxhorizontal`) when `laparams` is passed to
`pdfplumber.open(...)`. Had been removed in `0.5.24` via 1f87898.
Also adds a test for this behavior.
Jeremy Singer-Vine