Investigate issue6961 test due to its frequent test failures

[yurydelendik]

The recently affected runs:

• Removes global PDFJS usage from the src/core/. #7053 (comment)
• Logs test time. #7111 (comment)
• Ensure that TrueType font tables have uint32 checksums #7098 (comment)
• Convert uniXXXX glyph names to proper ones when building the charCodeToGlyphId map for TrueType fonts (bug 1132849, issue 6893, issue 6894) #7069 (comment)

[yurydelendik]

Test is disabled to save efforts/resources on other pull requests.

[timvandermeij]

Yes, it seems to fail quite often, so it's good to disable it for now. I wonder what's wrong with it as it loads quite fast for me locally. This file came from 07e1ad4. If we can find out what's wrong with it, I might be able to provide a new file generated by the same tool, as I provided the current file too.

[Snuffleupagus]

Should we attempt to re-enable this test-case now, or should we simply close this as WONTFIX?

[timvandermeij]

I'd say we can try enabling it since many fixes were made since this issue was originally opened. If we run the test suite with it a couple of times and it passes, we're safe to re-enable it. If not, I'm not sure what is wrong with it and we can close this issue. It might be that all the test framework fixes and performance fixes have actually fixed the problems we encountered before in the meantime.