pdf extension: blurry text

[Gee-Bee]

UV version:

 [email protected]

I'm submitting a:

• [ x] bug report
• [ ] feature request
• [ ] support request

Current behavior: Text in pdf files is blurry. It was introduced in #742. Pdf is rendered in initial scale (0.7), then canvas height is set by css, making the text in pdf blurry.

Expected behavior: Text in pdf files should be sharp. It should be rendered by pdf.js at correct scale to fit the container height.

(working on PR)

Related code:

// set the canvas height with CSS
this._$canvas.css({
    height: canvas_height
});