Incorrect explanation in the second example in:
https://www.perforce.com/manuals/jenkins/Content/P4Jenkins/poll-build-filter-exc-view-mask.html

This example is NOT in the view mask because the view mask references ‘//depot/main/tests’ but index.xml is in ‘//depot/main/test’:

The change below triggers a build because index.xml is in the view mask:

//depot/main/test/index.xml
//depot/main/src/build.xml