Lasso select is broken with non-circle markers

[bryevdv]

The following code:

from bokeh.plotting import figure, output_file, show
import numpy as np

p = figure()

x = np.linspace(0,10, 1000)
y = np.sin(x) + np.random.random(len(x)) * 0.1
# Create a figure p with tools="lasso"
p = figure(tools="lasso_select, box_select")

# Add square renderer r at x and y with selection_color="red"
# and nonselection_alpha=0.2
p.triangle(x, y, selection_color="red", nonselection_alpha=0.1)

# This code is already written
output_file("hover_glyph.html")
show(p)

results in

---

Works fine if a circle renderer is used instead.

This may be a report of the same issue: https://groups.google.com/a/continuum.io/forum/?pli=1#!searchin/bokeh/super$20jumpy$20and$20barely$20responsive/bokeh/FptxSPlvBUE/NIGh3ZuTCAAJ