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To make my previous posts easier to understand, here are all the common temperature formats and which ones work/don't work (test for yourself):
21 °C or 21°C or 21° C 
21 C or 21C 
21 Celsius or 21Celsius (also other conversions don't work if you write out the full units instead of the abbreviation, like 21 kilometers per hour vs. 21 km/h)
21°
It's kind of a limited feature if only one format works.
@maxl You can add your own search engine to Opera. You won't be able to choose it as default, but you can set a keyword like "q" for Qwant, so when you want to search on Qwant you would just have to type in the address bar:
q [search term]
When you add a search engine, put these settings (for Qwant):
I agree that it's stupid that Opera won't let you set a custom search engine as your default search engine though.
Btw, Amazon search engine already exists in Opera.
As the title says, lots of emojis still show up as blank boxes/squares instead of the emoji. Can you please implement support for whatever the latest standard is?
I use the extension "EmojiOne" but if I actually post some of those emojis on different sites, Opera doesn't display them properly - just the little blank box/square.
@richbordoni Also I just realized that < [number] ° [Celsius or Fahrenheit] > as in < 21 ° Celsius > doesn't work either. Nor does < [number] [Celsius or Fahrenheit] > as in < 21 Celsius > obviously.
Although that may be an issue that deserves a new thread because, for instance, something like < 75 kilometers per hour > doesn't work either. It has to be < 75 km/h > which seems like an arbitrary constraint.
@leocg Oh, I see.
Looks like it only works with < [number] ° [C or F] > as in < 21 °C >. It doesn't work with < [number] [C or F] > as in < 21 C > which is far more common to run into. I had to search two different weather websites before I ran into the < [number] ° [C or F] > format.
Also, this might be a lot more complicated to implement, but it would be nice if it would also convert just < [number] ° > as in < 21° >. That is a very common format as well. Obviously Opera wouldn't know if it was in C or F so it would have to give both conversions, so not sure if that would be something the devs would ever want to implement...
But I would really like to see < [number] [C or F] > implemented because that's very common. I had to specifically look up how to type the degrees symbol (and I wasn't even able to on my laptop, I had to copy + paste it) so many times the degrees symbol will just be omitted.
As the title says. The search pop-up is extraordinarily useful and one of Opera's best features in my opinion. It just seems like a glaring omission not to include temperature conversion as I feel that is an extremely common conversion that people look up.
Thanks for listening!
Well, it's not an instantaneous translation like the feature you're suggesting would be, but the "Translator" extension on the front page of Opera's extensions site acts quite similar to what you're suggesting (https://addons.opera.com/en/extensions/details/translator/).
If you highlight a block of text, all you have to do is click on the Translator icon in your toolbar and it will automatically paste in the text, auto-detect the language, and translate it for you. It's actually quite good. So like I mentioned, it's not instantaneous translation like you want but it's really only one quick extra step.