5f83bc5cfe
This PR changes how the Pan & Zoom feature of images displayed in the attachment lightbox are handled. The existing method of using a canvas element is replaced by the Panzoom library (timmywil/panzoom). This library is lightweight and has 0 transitive dependencies. This fixes #20759 where the issue is that the viewport of a zoomed image was not expanding to fill the available space on the page. Switching to this new library also solves several other UX issues: * Images are no longer blurred when in Pan & Zoom mode. * The zoom behavior itself uses focal point zooming: zooming occurs where the cursor is on the image instead of at the center of the image, reducing the need for extra panning. * CSS transitions are used for a more visually pleasing experience when switching images, toggling zoom off, etc. * The library has the potential to open other file types which leaves that option open for us in the future. |
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Zulip overview
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Fortune 500 companies, leading open source projects, and thousands of other organizations use Zulip every day. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
Zulip is built by a distributed community of developers from all around the world, with 74+ people who have each contributed 100+ commits. With over 1000 contributors merging over 500 commits a month, Zulip is the largest and fastest growing open source team chat project.
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