This commit implements the following improvements for the test:
- Replace the hardcoded highlight padding with a dynamic calculation. It
turns out that the amount of padding can differ per system, possibly
due to e.g. local (font) settings, which could cause the test to fail.
The test now no longer implicitly depends on the environment.
- Remove the page offset subtraction. It's only needed for one assertion,
and we can simply add the page offset there once.
- Improve the "magic" numbers in the test. The number 5 is removed now
that the padding calculation made it obsolete, the number 28 is changed
to 30 because that's the actual value in the PDF data and the number 4
is explained a bit more to state that the space also counts as a glyph.
- Annotate the steps and checks to improve readability of the test and
to explain why certain calculations have to be performed.
- For the generic viewer we use @fluent/dom and @fluent/bundle
- For the builtin pdf viewer in Firefox, we set a localization url
and then we rely on document.l10n which is a DOMLocalization object.
The current test fails intermittently only on Windows for unknown
reasons: the code is correct and on Linux it always passes. However, we
have already spent quite a lot of time on this test, so rather than
spending even more time on it I figured we should look at what behavior
the test is trying to check and find an alternative way to do it that
can't trigger this intermittent issue anymore.
This commit changes the test to use a term that only exists once in the
entire document so we cannot accidentally highlight another match
anymore. This doesn't change anything about the behavior that this test
aims to check: we still test searching in the XFA layer, we still test
that the original term is matched case-insensitively and we still test
that that match is actually highlighted. Note that the only objective of
the test is confirming that the search functionality covers the XFA
layer, so the exact phrase/match is not the interesting bit.
