I’ve decided to finally solve the PDF preview problems. Until now I was using PDF.js, unfortunately due to poor performance of the WebView component its functioning was problematic (slow performance, application hangs out). In the newest version there will be a new mechanism for previewing PDFs - based on rendering individual PDF pages to images.
In the basic implementation the PDFBox library is responsible for rendering PDFs to images. It is not an ideal solution - it works well with “simple” PDFs. When converting more complex ones it uses a lot of memory, so I decided to introduce the first external optional dependency - XPDF. Due to the license, I can not distribute it with the application, but I provided a comfortable way to automatically download the necessary dependencies in the application settings.
