Hello @aiyumi! Thank you for using this category. I like the way you gave a detailed explanation of how this feature can be implemented. The structure of your post is cool and technical. I would have even staff picked your contribution, but it's sad to say that your contribution is a duplicate here. I strongly recommend that you scan for duplicate on whichever project repository you want to suggest or contribute on. These will save your time and energy on working on other unique ideas. Consider having a look at this post for guidelines
Thank you.
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Oh, this is sad. I completely forgot to check the issue tracker, silly me!
And it is also sad that the existing issue had been opened so long ago and so little progress has been made...
Edit (2018/07/29): and I still find myself spending my time and energy on this... earlier today I tried to redirect my suggestions to their issue #1754, also informing what files in the source code have the buttons. The issue had been closed for a couple of months. Now, they've reopened it. Here's to hoping something comes out of this.