Try to prevent CanvasGraphics_getSinglePixelWidth from intermittently returning incorrect values in Firefox (issue 7188)

[Snuffleupagus]

Note: Locally this patch causes a number of test "failures", all of which are completely imperceivable to the naked eye.

Fixes #7188.

[Snuffleupagus]

/botio test

[pdfjsbot]

From: Bot.io (Linux)

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Received

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

Live output at: http://107.21.233.14:8877/c5338d3964eb8b2/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

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

Live output at: http://107.22.172.223:8877/ae295ac51082085/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Failed

Full output at http://107.22.172.223:8877/ae295ac51082085/output.txt

Total script time: 21.09 mins

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

Image differences available at: http://107.22.172.223:8877/ae295ac51082085/reftest-analyzer.html#web=eq.log

[pdfjsbot]

From: Bot.io (Linux)

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Failed

Full output at http://107.21.233.14:8877/c5338d3964eb8b2/output.txt

Total script time: 27.71 mins

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

Image differences available at: http://107.21.233.14:8877/c5338d3964eb8b2/reftest-analyzer.html#web=eq.log

[Snuffleupagus]

/botio test

[pdfjsbot]

From: Bot.io (Linux)

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Received

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

Live output at: http://107.21.233.14:8877/1f135d7bf70fcc5/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

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

Live output at: http://107.22.172.223:8877/0d6d3ce3900d0ca/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Failed

Full output at http://107.22.172.223:8877/0d6d3ce3900d0ca/output.txt

Total script time: 23.36 mins

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

Image differences available at: http://107.22.172.223:8877/0d6d3ce3900d0ca/reftest-analyzer.html#web=eq.log

[pdfjsbot]

From: Bot.io (Linux)

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Failed

Full output at http://107.21.233.14:8877/1f135d7bf70fcc5/output.txt

Total script time: 29.11 mins

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

Image differences available at: http://107.21.233.14:8877/1f135d7bf70fcc5/reftest-analyzer.html#web=eq.log

[yurydelendik]

@Snuffleupagus can you add a code comment about it's being a workaround? r+ with the comment

[Snuffleupagus]

@Snuffleupagus can you add a code comment about it's being a workaround? r+ with the comment

A comment has been added, thanks for the review!
(Since no functional changes were made since the last round of testing, so I'll just try to generate new references directly.)

/botio makeref

[pdfjsbot]

From: Bot.io (Linux)

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Command cmd_makeref from @Snuffleupagus received. Current queue size: 0

Live output at: http://107.21.233.14:8877/014e82520074900/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

Command cmd_makeref from @Snuffleupagus received. Current queue size: 0

Live output at: http://107.22.172.223:8877/31e1ddee5ece68b/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://107.22.172.223:8877/31e1ddee5ece68b/output.txt

Total script time: 23.50 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/014e82520074900/output.txt

Total script time: 27.86 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed