Okay, probably this `bounds` is a problem its size is empty. > OwnLayer p=0x7f63c45b18d8 f=0x7f63c7dd0700(ScrollbarFrame(scrollbar)(-1)) key=812 bounds(11280,0,0,0) layerBounds(11280,0,0,0) visible(11280,0,720,24000) building(11280,0,720,24000) componentAlpha(0,0,0,0) clip(0,0,0,0) asr() clipChain(0x7f63c45b1200 <0,0,0,0> [root asr]) ref=0x7f63c7dd0020 agr=0x7f63c7dd0020 (flags 0x0) (scrolltarget 7) whereas when the bar appears; > OwnLayer p=0x7fe156459608 f=0x7fe157342700(ScrollbarFrame(scrollbar)(-1)) key=812 bounds(11280,0,720,24000) layerBounds(11280,0,720,24000) visible(11280,0,720,24000) building(11280,0,720,24000) componentAlpha(0,0,0,0) clip(0,0,12000,24000) asr() clipChain(0x7fe15645a0d8 <0,0,12000,24000> [root asr]) ref=0x7fe157342020 agr=0x7fe157342020 (flags 0x0) (scrolltarget 19) The size looks reasonable.
Bug 1683612 Comment 9 Edit History
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Okay, probably this `bounds` is a problem, its size is empty. > OwnLayer p=0x7f63c45b18d8 f=0x7f63c7dd0700(ScrollbarFrame(scrollbar)(-1)) key=812 bounds(11280,0,0,0) layerBounds(11280,0,0,0) visible(11280,0,720,24000) building(11280,0,720,24000) componentAlpha(0,0,0,0) clip(0,0,0,0) asr() clipChain(0x7f63c45b1200 <0,0,0,0> [root asr]) ref=0x7f63c7dd0020 agr=0x7f63c7dd0020 (flags 0x0) (scrolltarget 7) whereas when the bar appears; > OwnLayer p=0x7fe156459608 f=0x7fe157342700(ScrollbarFrame(scrollbar)(-1)) key=812 bounds(11280,0,720,24000) layerBounds(11280,0,720,24000) visible(11280,0,720,24000) building(11280,0,720,24000) componentAlpha(0,0,0,0) clip(0,0,12000,24000) asr() clipChain(0x7fe15645a0d8 <0,0,12000,24000> [root asr]) ref=0x7fe157342020 agr=0x7fe157342020 (flags 0x0) (scrolltarget 19) The size looks reasonable.