When a developer answers the original question, you'll know. But your thread was almost exactly a copy of the original (which you posted in, so you knew it was there) and thus is redundant. It's in the rules that duplicate threads get closed or removed. As do threads like this ...
You just go to https://forums.opera.com/search?term=&in=titlesposts. You can get to it by clicking the magnifying glass icon at the top of the page and just hitting enter. There you can select the category you want to search in. You can also type in the user box to only search for a certain user.
For example, to search for all "Opera for Android" posts by you and sort them by last reply time in descending order, you could create a search for:
in "Menu -> settings -> browser -> search -> manage search engines" and set a keyword like 'os'. Then, in Opera's address field, you'd type 'os' then a space and press enter. Or, type os term.
Of course, you could just use the forum search page to do that.
We're aware of this problem and working on a solution. What's strange about this is that for some posts we see that HTTP vs HTTPS have separate comments and for some posts they are in sync. Looks like some Disqus problem to me but I haven't had time yet to look deeper into this.