Missing pdfminer layout related objects "textboxhorizontal" and "textlinehorizontal"

[frascuchon]

Describe the bug

Hi. I'm not really sure if is a bug or an expected behaviour in newer versions, but the related pdfminer layout objects are missing under page.objects dict when passing laparams configuration.

Code to reproduce the problem

with pdfplumber.open(<path>, laparams= {}) as pdf:
  page = pdf.pages[0]
  assert "textboxhorizontal" in page.objects.keys() # This will fail

Expected behavior

Like previous versions, passing the laparams configuration on pdf creation, will make available layout objects.

Actual behavior

The custom objects "textboxhorizontal" and "textlinehorizontal", related to pdfminer layout analysis and given by default in previous versions (0.5.16 at least), are missing.

Environment

• pdfplumber version: 0.5.26
• Python version: 3.7.6
• OS: Mac

Additional context

I think the else condition in function iter_layout_objects discard all high-level objects that could contain textual info (horizontal textboxes and horizontal lines)

pdfplumber/pdfplumber/page.py

Line 199 in 0027278

def iter_layout_objects(self, layout_objects):

[jsvine]

Hi @frascuchon, and thanks for your interest in this library. I'll look into this.

[jsvine]

Thanks again for opening the issues, @frascuchon. Those objects should be accessible again in the latest release, 0.5.27.