Make launch feedback look smoother

The Entropystrequested to merge
the-entropyst/kwin:smoother-launche-feedback into master

Makes the bouncing icon launch feedback look smoother using values calculated on the fly instead of hardcoded ones.

Screencast :

edit: Juste added an alternative version because both looks good and i'm not sure what is the best

edit 2: We settle with the original proposal for now

Edited by The Entropyst

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