[stable20] Fix PDF viewer failing on Edge (not based on Chromium) #299
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Since version v2.4.456 the PDF.js library is published as two different packages, a non-translated/non-polyfilled build for modern browsers and an ES5 compatible build for older browsers. The PDF viewer was using the build for modern browsers, so it did not work, for example, on Edge (the original version not based on Chromium). This has been changed to use the ES5 build instead for maximum compatibility. Unfortunately, the ES5 build requires allowing "unsafe-eval" in the iframe where the PDF.js library is loaded. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
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backport of #297