I forgot to change `holEl.textContent` with `holEl.innerHTML` after I shifted the links parsing line at the last. Earlier, I felt its need to preserve the anchor tags. Finally, fixed it!
Modified the way to detect and apply syntax highlighting so that it can used along with normal text and katex at the same time, in the same message. It also contains some previous changes made by the admin(you) of the server.
Solved the most annoying problem for the mobile clients, the sidebar scroll. Yeah, we've experienced this situation when we couldn't invite someone who's at the last end of the sidebar with our mobile browser cause sidebar spills out of the screen when there's a lot of users connected. But, now this is solved by fixing the height of sidebar container to 90% when shown and to 0% when hidden. Ah! I was really grieving to get rid of this shit.