Add bulk delete feature

[apsinghdev]

fixes #3840

This PR adds a bulk delete feature. It lets a user drag to select blocks and delete them in a single click.

Here is the demo of this

2024-05-04.23-37-46.mp4

[apsinghdev]

@walterbender please take a look and suggest modifications if any.

[walterbender]

In general, it seems to work well. However, there is one critical bug (apparent in my testing and in your video). If you delete a Note Block, it seems to be creating a Silence Block. I suspect that this is due to the order in which the blocks are being deleted. If you first delete the Pitch Block inside of a Note Block through the normal delete mechanism, it will create a Silence Block. That Silence Block is not on the bulk-delete list. So I think you may need to delete from the outside-in rather than in either an arbitrary order or inside out.

One small issue with coding style: please be consistent with the use of spaces around operators.

Also, it seems that restore will restore one block at a time, which I guess is OK for now. At some point, we may consider restoring the entire bulk delete at once. But I would save that for a different MR.

[apsinghdev]

@walterbender sir Thanks for the review. I've got your point about getting the silence block after deleting the blocks. I will fix this bug as well as the coding style soon. Also, after completing this issue, I'll go ahead and implement Bulk-Restore as well.

[apsinghdev]

@walterbender can you please elaborate on this line "you may need to delete from the outside-in rather than in either an arbitrary order or inside out." a bit more?

I did some digging in the codebase and found the currently used delete mechanism to delete blocks. are there other better methods available in the codebase to delete the blocks?

[walterbender]

I mean delete the parent before the children in the context of a clamp-style block.

…

On Sun, May 12, 2024, 1:08 PM Ajeet Pratap Singh ***@***.***> wrote: @walterbender <https://github.com/walterbender> can you please elaborate this line "you may need to delete from the outside-in rather than in either an arbitrary order or inside out." a bit more? — Reply to this email directly, view it on GitHub <#3885 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA6PXYPDTTBKTYF733QR4HTZB6OZNAVCNFSM6AAAAABHHAPVH6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMBWGMYTMOBVGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[apsinghdev]

@walterbender I have made the changes and the feature seems working fine. Please take a look.

2024-05-22.23-10-44.mp4