While we might never be able to have 100% of our code strict, we can at
the very least do it for all of our tests. This ensures that our tests
are using our API with the types as intended by the test author, and not
silently be cast to what our API requires.
* Fix Xlsx Read Ignoring Comments
Fix#3654. Several places in Reader Xlsx make a truthy test for `$zip->locateName()`. However, zero is a legitimate result which should not be treated as false. Change all existing tests in this form to test for (in)equality to false. For the record, there is no existing exposure of this kind in Reader Ods.
* Absolute Path In Printer Settings File
Another unexpected use of an absolute path in a rels file. Easily fixed, but the test file is 7+ MB. I have asked the problem reporter to try to find a smaller file.
* Reduced Size of Test File
It was 7.8MB. I manipulated the file to replace all the comment backgrounds in column AN with a single image, much smaller than the existing ones. This reduced the file size by over 6MB. It's still larger than I'd like, but might be acceptable. (AN121 uses a different background than the others just so that I could check that they would all be copied faithfully.)
This change was suggested by issue #2316. There was a problem reading Xlsx comments which appeared with release 18.0 but which was already fixed in master. So no source change was needed to fix the issue, but I thought we should at least add the test case to our unit tests.
In developing that case, I discovered that, although comment text was read correctly, there was a problem with comment author. In fact, there were two problems. One was new, with the namespacing changes - as in several other cases, the namespaced attribute `authorId` needed some special handling. However, another problem was much older - the code was checking `!empty($comment['authorId'])`, eliminating consideration of authorId=0, and should instead have been checking `isset`. Both problems are now fixed, and tested.