FileUpload (advanced): Multiple FileUpload - regressions when some files do not meet the limits

[christophs78]

Describe the bug

Uploading following files

13.0.x

14.0.0

Regressions

• only one error is shown
• after one error no further files are processed

Related to refactorings done for 14.0.0 as part of #11001, #11043, #11044

Reproducer

https://primefaces.org/showcase/ui/file/upload/multiple.xhtml
Select multiple files. Some within the size-limit. Some to big ones.

[christophs78]

Did some analysis....

Why do we get only one validation-error?

And - once there is any validation error nothing is uploaded any more:

So IMO a good amount of refactorings is required to restore the behaviour we had up to 13.0.x.
(Show a message for each file which does not meet´s the requirements. Allow to upload that part of files which meet the requirements.)

All of this is independent of (explicit) using CSV or using drag´n´drop - feature.

@tandraschko : I think we need at least your thoughts about this.

[tandraschko]

yeah, seems that the FileValidator would need to throw a array of msgs
this is a bigger refactoring

for me the behavior that we only upload when all files are valid is ok, we should just show all messages

[christophs78]

I´ll try to look at the one message per invalid file part. Maybe this is something we can fix for 14.0.x too. Let´s see.