Line disappers if you draw it for too long about lorien

[nm17]

Found the cause for this bug:

W 0:00:12.398   _prefill_polygon: poly has too many indices to draw, increase batch buffer size
  <C++ Source>  ./drivers/gles_common/rasterizer_canvas_batcher.h:1628 @ _prefill_polygon()

Increasing the batch buffer in project settings seems to solve this problem somewhat, but it still deletes very large lines.

[mbrlabs]

Thanks for the report. Yeah, that's a Godot limitation. There is an easy fix though: if a certain length is reached (say 1000 points per brush stroke) we can finish the current stroke and immediately start a new one, so it looks like one continous line.

[mbrlabs]

Fixed in bdf7eca