I have regularly this problem: when I export lines from QGIS to Illustrator with a
.svg), my lines are destroyed in several lines.
Is there a way to keep my lines unbroken?
Up and Coming QGIS 3.10 has a potential solution:
"Geospatial PDFs can now be created either by exporting the main QGIS map canvas, or by creating and exporting a custom print layout. For instance, when you select the “Save Map as PDF” option from the main QGIS window, you’ll see a new group of Geospatial PDF related options:
At its most basic, Geospatial PDF is a standard extension to the PDF format which allows for vector spatial datasets to be embedded in PDF files. If the “Include vector feature information” checkbox is ticked when creating a Geospatial PDF output, then QGIS will automatically include all the geometry and attribute information from features visible within the page. So if we export a simple map to PDF, we’ll get an output file which looks just like any old regular PDF map output…"
Credit and Source (including screenshot) https://north-road.com/2019/09/03/qgis-3-10-loves-geopdf/