At the moment it looks like the add topic button is clickable even when you are in the act of writing a new topic. The button should appear disabled so that it discourages editors from attempting to click on it.
|mediawiki/extensions/DiscussionTools||master||+12 -0||Make "Add topic" button in Vector sticky header disabled after click|
|Open||None||T276497 Scale DiscussionTools to all projects|
|Open||None||T310959 Scale Usability Improvements to all projects|
|Open||None||T319146 [Release Ticket] Offer Usability Improvements as default-on feature at all projects (desktop)|
|Open||None||T302547 [Usability Improvements] Deploy as Beta Feature at all wikis (desktop)|
|Open||None||T249579 [EPIC] Usability improvements: make the actions, activity and content within talk pages easier to understand|
|Open||None||T269963 [EPIC] Talk Page Frame|
|Open||None||T304372 [Release ticket] Deploy Page Frame as Beta Feature at Partner Wikis|
|Resolved||matmarex||T307726 Add topic button should become disabled after click|
To elaborate: the only way to make a mw-ui-button look disabled is to set the disabled attribute, but that only works on <button> and not <a>. In addition, even if we hacked around that, there's no way to make the icon color/transparency adjust to the disabled state. I'm not very comfortable hacking around this many things, and also not comfortable inventing a new "proper" way to do it for a twice-deprecated legacy UI library.