Ulrich Huber

@Technius did a great job highlighting the current setup. The new system will go a slightly different approach. Currently we only have one thread rendering changes. The new system will...

Actually the main issue is currently that we directly draw on the canvas of the view. So we can't make drawing and zooming concurrent. That is what the new system...

> Also, pdf cannot be opened, it gives a dialogue: 'Xournal++ cannot open files in the “Apple PDF pasteboard type” format.' We are working on that but it is actually...

Please provide input logs. See the wiki for how to do that. This sounds a lot like a device sending faulty events.

Same thing as for the original poster. Please provide input logs. And the approximate timestamp of the bug. We can then start searching for the issue.

Could it be that you use kde and the system is caching a lot? In those scenarios KDE is known to drop some events.

This really sounds like a DE problem and not a X++ issue.

I'm currently unable to check the input logs. But when your DE freezes up it is quite common for GTK apps to not get all events if you are using...

Could you try giving all desktop environment processes higher scheduler priorities? For me that fixes the problem if it occurs. If that does not help I might have an idea...

Have you tried out the option to merge pen button events with tip events?