Add screen-edge column scrolling

[newfullname]

This adds optional column scrolling when the mouse reaches the left or right screen edge.

How it works:

• move the cursor to a screen edge
• keep it there for the set delay
• Karousel scrolls one column at a time

It also adds:

• a setting to turn it on
• a delay setting

Note:

• this can conflict with Plasma’s default screen-edge actions, so you may need to change or disable them

I made this for myself, but I am sharing it in case it helps others too. I find it handy because when I am already using the mouse, like in a browser, it is easier for me to scroll this way sometimes.

[peterfajdiga]

Thank you for the pull request! I haven't found the time to try it out yet, though, and I'm not sure when I will :/

[peterfajdiga]

Thanks again for the pull request. It's a good idea and I've actually already been able to achieve screen-edge scrolling a different way. I'll share it with you in case you find it useful and also in the hope of avoiding adding more code that I will have to maintain. 😄

In System Settings -> Window Management -> Window Behavior -> Focus, set Window activation policy to Focus follows mouse.

Then in Karousel settings under the Parameters tab, make sure left and right margins are larger than horizontal gaps between windows, so that you can always see a bit of the next window at the edge of the screen.

Please let me know how that works out for you, if you do try it out.