blurry pdf poppler import of Matplotlib v3.5.1 chart

Steps to reproduce:

• open Inkscape
• import "0_input_test_lines.pdf"
• try cairo-poppler option
• export as pdf

What happened?

• import is ugly with cairo.

What should have happened?

• import has sharp bars like the internal import or if you add image-rendering:crisp-edges to the svg node.

Note: original issue was regarding the internal import method and the fact that the pdf export did not match it (that issue is tracked in inkscape#698)

Inkscape Version and Operating System:

• Inkscape Version: 1.2.1 windows / 1.3-dev linux
• Operating System: windows / linux

Example files:

0_input_test_lines.pdf

V1.2.1_windows_internal_lib_import.pdf

V1.2.1_windows_cairo-poppler_import.pdf

V1.3-dev__b934569__2022-09-11__appimage_internal_lib_import_coarse.pdf

V1.3-dev__b934569__2022-09-11__appimage_internal_lib_import_veryfine.pdf

V1.3-dev__b934569__2022-09-11__appimage_cairo-poppler_import.pdf