Ignore double negative in Lexer_getNumber (issue 6218)

[Snuffleupagus]

Basic mathematics would suggest that a double negative should always become positive, but it appears that Adobe Reader simply ignores that case. Hence I think that it makes sense for us to do the same.

Fixes #6218.

[timvandermeij]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_preview from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/a9abbbb863c793a/output.txt

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/a9abbbb863c793a/output.txt

Total script time: 0.63 mins

Published

• Viewer: http://107.21.233.14:8877/a9abbbb863c793a/web/viewer.html
• B2G Viewer: http://107.21.233.14:8877/a9abbbb863c793a/extensions/b2g/content/web/viewer.html
• Extension: http://107.21.233.14:8877/a9abbbb863c793a/extensions/firefox/pdf.js.xpi

[timvandermeij]

/botio test

[pdfjsbot]

From: Bot.io (Windows)

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Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.22.172.223:8877/a10cd373a1e8daf/output.txt

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/873e390992153c2/output.txt

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/873e390992153c2/output.txt

Total script time: 19.31 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://107.22.172.223:8877/a10cd373a1e8daf/output.txt

Total script time: 20.33 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[timvandermeij]

Looks good, thanks!