https://bugs.kde.org/show_bug.cgi?id=429447

--- Comment #10 from Fabian Vogt <[email protected]> ---
I see that the code is using mapToGlobal quite liberally. Note that mapToGlobal
really uses global screen coordinates, which aren't reliable and shouldn't be
used for such calculations.

I set a breakpoint at followViewContainerGeometry and it's called even before
the window is visible, so mapToGlobal will return wrong values as there's no
window yet. That might be the cause of this.

It probably works for resizes because the window is visible at that point and
the stored window size might just trigger a resize event with similar effect.

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