In low-latency, the current line segment being drawn flickers when the stylus pen is lifted.

[hongtao1019]

In FastRenderer, lifting the stylus pen triggers a write to the double buffer, i.e., it triggers the onDrawDoubleBufferedLayer method callback. At this point, the current line segment being drawn will flicker. Could you please explain the specific reason for this?

[hongtao1019]

fix