Supplied transition key ignored (or mangled)

[grumpygary]

I checked the Vue source code (2.6.10). It appears that it does not respect key names for transitions -- it mangles it to includes its own prefix (__transition-${this._uid}- + myKey) , which is subject to change if a prop changes. This appears to have been on-purpose (it literally checks to make sure it's using the internal prefix). I consider this a bug, as it causes a full re-render of the transitioned vnode if all I want to do is change the exit transition class.

For example, I might have a "stack" of pages that slide to the left to exit when going forward, or to the right to enter if going backwards; otherwise no animation. So the transition depends on what the user is doing. The enter transition is not the issue, but if I change the leave active class, Vue will change the transition key, which will re-render the page (though nothing has changed), causing a brief flicker.

And I can't find a work around...

My question(s): what is the rationale for not respecting a supplied transition key? And is there a work-around?

Originally posted by @grumpygary in #9363 (comment)

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