Feature Request : Make the smart cache a little smarter

The way it is now : I have a timeline wich is completely cached (blue line on top).
I just dragged (not dropped), only dragged a clip over the timeline.. did not drop the clip into the timeline, and then changed my mind and dropped the clip back into the bin.... and the timeline turns red from where the clip hovered over the timeline.
Nothing changed at all... why does my timeline start to cache again ?
fwiw, there is one thing a bit special in my timeline, and that is that I have a video track on top that has a logo overlay, spanning the entire timeline. But even so, when nothing changes in the timeline, I don't see the need to re-cache.
Or am I doing something wrong ?
I just dragged (not dropped), only dragged a clip over the timeline.. did not drop the clip into the timeline, and then changed my mind and dropped the clip back into the bin.... and the timeline turns red from where the clip hovered over the timeline.
Nothing changed at all... why does my timeline start to cache again ?
fwiw, there is one thing a bit special in my timeline, and that is that I have a video track on top that has a logo overlay, spanning the entire timeline. But even so, when nothing changes in the timeline, I don't see the need to re-cache.
Or am I doing something wrong ?