If I create a mouse gesture it leads to a strange behavior of the scroll function.

When I do the following:
1. I scroll down to the bottom in dolphin.
2. I press the gesture mouse button and release it. (just press, no gesture)
3. I press the left mouse button somewhere in the same window and release it.
4. I use the scroll wheel to scroll down one notch ...

What then happens is:
Dolphin doesn't scroll down but instead scrolls up to the very top!
Very disturbing!

As soon as the gesture is disabled, the behavior returns to normal.
The same happens if I just install Easystroke. Just the installation (without any gesture created) leads to the same problem.

Does anyone have an idea what's going on here?

I love dolphin and use it for many years. But I need the gesture functionality. I would hate to need to leave dolphin just because of this! Please help!

The same problem accurs with Kate btw and several other kde-apps.

Greetings from Germany!

PS: I am running Linux Mint 18.2, KDE-Plasma-Version 5.8.8, KDE-Frameworks-Version 5.36.0, 32 bit

Has nobody an idea?