Some browsers are unable to display very tall canvases. The barrier seems to be around 32767 pixels in heigh [1]. Therefore, it is possible to make the graph dissapear from the graphlog view by specifying a reasonably large "revcount" parameter. As the canvas size is calculated on the server side, there could be some check to truncate the revcount value to the largest number that keeps the size of the canvas within a drawable constraint. [1] http://stackoverflow.com/questions/6081483/maximum-size-of-a-canvas-element
I just checked the 2.8 release that adds infinte scrolling to the paper theme and this issue is even easier to reproduce: just keep scrolling until the graph disappears. Log indentation is still preserved.
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