Multiple persons have reproduced this on various iOS 12 devices.
One cannot select (“paint”) text with a long press after message composer has been used. So repro steps are simply:
Broken since 2.1 stable (we use only stables), reproed in Try. Basic UX regression, so a solid candidate to be backported in the stable branch.
Thanks for the report, I can reproduce this. Will look for a solution.
I spent a few hours looking into this issue, and I couldn’t figured out how to solve it.
But I did notice though that this can happen on any website, focusing on an input and then focusing out of it causes the text on the page to become unselectable. This points to a general iOS 12 bug, not a Discourse-specific bug.
Here is a quick video done with the Simulator to demonstrate the issue on google.com for example:
ios12 has multiple improvements on text selection. So I wouldn’t be surprised if there were bugs with it.
And I should add, I don’t have iOS 11, but @Blake does, and he tested the OP’s issue with iOS 11, and he couldn’t reproduce the issue in iOS 11.
Looks like this isn’t our bug @ljpp . Did you want to write Apple and tell them how they should restructure their development process to make it better in your professional opinion? 
I’ve also experienced this issue a lot, and it’s just been brought up by a member on the forum:
I wonder if we could find some kind of workaround - or at least figure out what it is about the action of bringing up the composer window which triggers the bug.
I’m on Beta 2 of iOS 12.1 build on my iPhone and cannot repro this issue, quoting is fine. So please check this build (16B5068i) and it may be Apple has fixed it? I certainly saw a lot of broken things wrt Discourse on Safari 12 during the PB.
Looks like it’s fixed, thanks!
Thanks, good to know.
Sadly the fix doesn’t seem to be included in 12.0.1, which was publicly released today.
Keenly awaiting 12.1 public release… 
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