RJ TextEd

A PDFium based plugin to open PDF files inside the application like Text Editor Pro?

https://www.texteditor.pro/support/downloads/ (scroll to PDF VIEW).

Here is the PDFium control used by the Text Editor Pro developer:

https://github.com/TextEditorPro/TPDFiumControl

Since you have put your posts into "General discussion" board, let's discuss

So, why would anyone want to read their PDF files inside their text editor? Why do you think it would be beneficial for the user and more convenient, compared to opening them in a specialized reader? I could imagine only one scenario, wherein you programmatically prepare your PDF in RJ TE, compile it (with external tool(s) on the command line) and have it automatically refreshed in PDF view of RJ TE, but perhaps there are (many?) more?

For the scenario I described above adding PDF-viewing capabilities to RJ TE would be -- in my very humble opinion -- tantamount to adding bloat.