fix: iOS touch in segmentation brush mode

[madhavajay]

This PR attempts to fix the touch input issues on label studio when using iPad Apple Pencil and brush / segmentation mode.

It isn't 100% perfect but ImageView.js is complex and I don't pretend to know all the edge cases.

There are some videos here showing the issue and it working afterwards.
https://imgur.com/a/fY4LsSf

It seems like @lavrton suggestion of mapping the events directly isnt enough: konvajs/konva#1361 (comment)

From what I can tell, the MouseEvent's have .offsetX and .offsetY however the TouchEvent's don't have these, but do have some similar values such as .layerX and .layerY. 🤷‍♀️.

Additionally, there is the need to pinch and zoom, but without e.preventDefault() doing things is particularly challenging.

My guess is that something like this would be optimal in the long term:
https://github.com/shuding/apple-pencil-safari-api-test

I know theres a lot of people using computers to label, but honestly, for brush style annotations, surely iPad support should be a #1 priority.

I am happy to help get this ready for merge if someone can help me understand what would be next to do.

[makseq]

Thank you for your amazing contribution!

[makseq]

@hogepodge please take a look at this PR

[hlomzik]

/git merge master

Error: Merge conflict detected, please resolve it using the git command line.

Workflow run

[farioas]

/git merge master

Error: Merge conflict detected, please resolve it using the git command line.

Workflow run

[lackray]

This PR attempts to fix the touch input issues on label studio when using iPad Apple Pencil and brush / segmentation mode.

It isn't 100% perfect but ImageView.js is complex and I don't pretend to know all the edge cases.

There are some videos here showing the issue and it working afterwards. https://imgur.com/a/fY4LsSf

It seems like @lavrton suggestion of mapping the events directly isnt enough: konvajs/konva#1361 (comment)

From what I can tell, the MouseEvent's have .offsetX and .offsetY however the TouchEvent's don't have these, but do have some similar values such as .layerX and .layerY. 🤷‍♀️.

Additionally, there is the need to pinch and zoom, but without e.preventDefault() doing things is particularly challenging.

My guess is that something like this would be optimal in the long term: https://github.com/shuding/apple-pencil-safari-api-test

I know theres a lot of people using computers to label, but honestly, for brush style annotations, surely iPad support should be a #1 priority.

I am happy to help get this ready for merge if someone can help me understand what would be next to do.

sadly,when the image become large,like 1M+, the touch draw region saved nothing after submit or update