Created attachment 98399 [details]
Test file (PDF)
Open PDF test file with LibreOffice Draw and you will see that line styles are all almost the same.
Created attachment 98400 [details]
Test file (SVG)
Vort committed a patch related to this issue.
It has been pushed to "master":
fdo#78241 PDF Import: add dashes support
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.