ExtensionMimeTypeGuesser::guessMimeType return less accurate MIME type when file extensions have multiple parts

Ran test-only feature

1) Drupal\KernelTests\Core\File\MimeTypeTest::testFileMimeTypeDetection
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'application/x-font'
+'application/x-compress'
/builds/issue/drupal-3477346/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php:53

Issue summary appears complete and change makes sense to me

Don't see anything else holding it up.

One minor comment about a slight loss of coverage. Fine to self RTBC

Self-RTBC as granted in #6.

Committed a5b0f9c and pushed to 11.x. Thanks!

As this is a bug and there is little risk of disruption, backported to 11.0.x, 10.4.x and 10.3.x

Thanks!

larowlan → closed merge request !9655

Automatically closed - issue fixed for 2 weeks with no activity.

This change introduced an issue if you have filenames which are equal to 0 (i.e. 0.jpg), because the while condition does not apply:

while (array_shift($file_parts)) {

I appended a patch to adjust this condition and fix the issue in my case.

@et.cetera see 🐛 ExtensionMimeTypeGuesser::guessMimeType must support file names with "0" (zero) like foo.0.zip Active for that bug fix.