Huh. I've never had that issue and had a bit of trouble recreating it, but did eventually "succeed". Does it at least save your comment/post draft, and restore it when you try again? Are you on iOS or Android?
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Yeah, it always saves a draft. I'm on Android, and I use the 3-button navigation and not gesture nav.
Here is a screenshot of it in action. I turned on the developer option to show touches, and you can see how wide the activation area is for dragging from the left.
I'm also using 3 button navigation on Android. I've tested it on a Pixel 8a running GrapheneOS and some Motorola device running stock OS. It's hard to say for sure, but it looks like the edge of the activation zone on both of my devices is roughly the same as yours, so I'm not sure why I don't run into the issue more often. Sorry I can't be more help.
Thanks for mentioning this issue as well! This behaviour is generally intended for iOS devices since thats the primary way to navigate back.
I can disable the swipe gesture for this specific case on Android devices in the meantime, and perhaps add a setting which enables or disables this navigation gesture globally in the future (this would take a bit more time as there’s a lot of pages to consider)
Like the other issues, I would suggest creating a new GitHub issue so that we can track this better. Thanks!