[marble] [Bug 453332] Crash on Panning with Equirectangular Projection

[Torsten Rahn]

https://bugs.kde.org/show_bug.cgi?id=453332

--- Comment #2 from Torsten Rahn <rahn at kde.org> ---
Hm, I haven't been able to trigger this when choosing "HighQuality" rendering
during Animations (See Settings) - this uses void
ScanlineTextureMapperContext::pixelValueApproxF instead of void
ScanlineTextureMapperContext::pixelValueApprox.
So I guess that this happens due to a rounding error which calculates the
position to be outside the "last/first" tile in a column.
Since nextTile() will still "stay" on the same tile we will reach out of
bounds.
The safe and lazy solution would be to correct the Y value to be still within
the bounds.
I wonder whether this issue could also be triggered for the x-case

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