Fix missing parent of tooltips for Wayland

[crazysmc]

In response to issue #3501

Each widget that uses TooltipWidget gets its own instance of it with itself as a parent set.

That fixes the issue for me on Wayland. Although I'm not using a tiling WM, the parent-less tooltips appeared in the wrong place before.

[ilya-zlobintsev]

This seems to solve the issue for me on Arch Linux using KDE 5.27. Tested on both QT5 and QT6.

[ilya-zlobintsev]

I've also tested sway - the behaviour is slightly different, the previews don't show up at all when hovering over something when the window is unfocused, but IMO that is fine as well

[Nerixyz]

Seems to work on Windows 10 with Qt 6. Works when the window is unfocused. Only thing I noticed is that tooltips will stay when the window is resized, but shouldn't be an issue.

[BKSalman]

tested on NixOS, it works using QT5

using this shell

nix-shell -p openssl boost qt5.full pkg-config cmake libsecret

[pajlada]

Thank you! Works as expected on Arch Linux w/ i3

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