wp_normalize_path does not take into account stream wrappers

[calin]

wp_normalize_path does not take into account stream paths using php stream wrappers. I've attached a patch to fix this.

[dd32]

This would be a good candidate for some unit tests covering the current and new behaviour here.

[calin]

@dd32 I've attached a patch for tests.

[dd32]

In 42387:

Filesystem: Allow wp_normalise_path() to handle PHP stream wrappers such as php:// correctly.

Props calin, dd32.
Fixes #42837.

[johnbillion]

In 43406:

Media: Update the @since tag for wp_normalize_path() as this has been backported to th 3.9 (and all other) branches.

See #42837

[johnbillion]

[42387] and [43406] should be merged into 5.0

[pento]

They were both merged into the 4.9 branch in [43393], so already exist in the 5.0 branch.