Append whitespace divs so matches still line up.
Work-around for filesystem:-URL bug (#4592).

Visit https://robwu.nl/pdfjs/filesystem-worker-bug.htm and follow the
steps to verify that the extension works as intended with this patch.
Move logic from viewer.js to chromecom.js

and also default to '' instead of DEFAULT_URL to avoid trying to
load a non-existent file when no file has been specified.
Fixes documentation for PDFPage.render
Introduces .jshintignore
Merge pull request #4595 from brendandahl/search-regression

Append whitespace divs so matches still line up.
Fix seac regression.
Merge pull request #4602 from yurydelendik/jshintignore

Introduces .jshintignore
Adds then method to the RenderTask
Merge pull request #4601 from yurydelendik/issue4401

Fixes documentation for PDFPage.render
Merge pull request #4599 from yurydelendik/issue4428

Adds then method to the RenderTask
Merge pull request #4596 from brendandahl/seac-regression

Fix seac regression.
Merge pull request #4598 from Rob--W/crx-filesystem-worker

Work-around for filesystem:-URL bug