Add Filter option Attached

[subrataemfluence]

In Media Library there should be ad additional filter "Attached" like "Unattached". This should give the opportunity to filter out exactly what we need to display rather than looking through "Uploaded To" column for its status.

[subrataemfluence]

Additional option "Attached" to be included in the dropdown

[subrataemfluence]

Filtered result using new Attached option added

[antpb]

Hello @subrataemfluence ! Thanks so much for the work you did on this. We were recently reviewing this ticket in the #core-media weekly meeting as part of our triage of issues that are new without response.

We are trying to come to a conclusion on a use case for the attached filter and where this would be useful for users in the Media Library. Could you potentially illustrate when a user would need to use this feature?

Also, I'm noticing a 'trash' filter in the patch provided. Can you provide some context on that change as well? We might want to alter the description and title of this ticket to mention that being part of the patch.

Thanks again for helping WordPress!

[subrataemfluence]

@antpb Here is my observation in support of Attached filter.

It gives the ability to know which media files are actually "attached" to post(s). We already have "All" and "Unattached". There is so far no way to know which are attached. The objective is to filter out attached media files and list them just like Unattached. Say I have 200+ media files but out of those only 5 are attached to some posts. "Attached" filter will make it easier for users to know which 5 out of 200 are attached.

Regarding the Trash filter, I am a bit confused. Honestly, don't remember if I added it! It's almost two years I uploaded the patch for 4.7.3. The confusing part is if I hadn't added it how it came under the patch. I will have to look into 4.7.3 since I can see the trash code block is present in 5.0.2.