Fix CodeEdit completion being very slow in certain cases

[ajreckof]

Fixes #80041

Okay so it is not really freezing it is just taking way way way way way way too long. What is actually happening is that it is trying to find all possible way to match the query inside way too long options. Just to give an idea of how bad this becomes here the query is around 40 characters long and options are often 200-300 long. which means at some steps it can go up to 10000000 matches which slow down the whole process. With that said I have a quick and easy fix that do make it quicker not really perfect but still usable it uses an altered version that gives more precedence to grouped by not looking further if the next character matches. Beware that this means the altered algorithm will take the first c in "MaincartoonCanvas" even for a queryy like "MainCanvas", this obviously mean it will rank differently option that show this behaviour . This is the worst case I could think of.

I made a quick PR there it runs smoothly even with OP really astronomical example (around a hundred or even more options with a size of around 300 for some).
#80041 (comment)

I also added some rename that were not properly done during the previous PR.

[Calinou]

I suggest changing the commit message to mention CodeEdit by name:

Fix CodeEdit completion being very slow in certain cases

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.1.2.