https://bugs.kde.org/show_bug.cgi?id=463197

--- Comment #9 from Metal450 <metal...@gmail.com> ---
It seems like the more generalized solution would be i.e.:

1) Set the total height of the scrollable container to the correct final
height;
2) Start *asynchronously* loading/filling out the thumbnails (i.e. not on the
same thread as is used for processing user interaction)
3) As the user scrolls, reprioritize loading so that the images near the
currently-visible view are loaded first
...Until done.

By pre-setting the correct scroll height right from the bat, the user will be
able to drag directly to any vertical offset (i.e. no need to scroll to the
bottom & wait for the current batch to load before they can scroll farther). 
And by loading not on the thread used for user interaction, it should never
lockup the UI, no matter how many there are to load.

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