Don't show clickable cursor on post titles that can't be expanded

[humphd]

What would you like to be added:

We have a neat new feature where you can click-to-expand post headers that are really long (added in #1380). It works great, but in the case that a post title is not long enough to need expanding, the click does nothing:

Let's see if we can only add the CSS cursor pointer when the post title is actually clickable. Another solution might be to make the ellipses (...) clickable instead? Not sure if that's good UX or even possible, though.

Why would you like this to be added:

It's odd to have UI that says "click here" but then clicking seems to have no effect. It would be better not to give the user the hint that something is clickable if it really isn't going to do anything.

cc @yuanLeeMidori.

[yuanLeeMidori]

I tried to calculate the length of the full title and compare it with the current length of title size in order to make the fullly-displayed ones non-clickable/non-expandable, but it didn't work. Alternatively, the title font size has been shrink so that the title will mostly be fully displayed. However, it is still good to have the feature that can distinguish between the expandable ones and the non-expandable ones.

Related PR: #2006

[aserputov]

@humphd can we close this one ?

[cindyorangis]

Hahaha, this is the old Gatsby UI! What a sight

[humphd]

This is still happening.