re-jitter on tap is unexpected

This may be intended behavior. But if so, it would be good to provide documentation of a workaround because it surprised me, and I would think others too

This only a slightly tweaked version of the categorical jitter example in gallery, that adds a tap tool.

You can also see it here: http://nbviewer.jupyter.org/github/birdsarah/bokeh-miscellany/blob/master/jitter on tap.ipynb

from bokeh.io import show, output_notebook
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.sampledata.commits import data
from bokeh.transform import jitter

output_notebook()

DAYS = ['Sun', 'Sat', 'Fri', 'Thu', 'Wed', 'Tue', 'Mon']

source = ColumnDataSource(data)

p = figure(plot_width=800, plot_height=300, y_range=DAYS, x_axis_type='datetime', tools='tap, save',
           title="Commits by Time of Day (US/Central) 2012-2016")

p.circle(x='time', y=jitter('day', width=0.6, range=p.y_range),  source=source, alpha=0.3, 
         selection_color='magenta', selection_alpha=1, size=8)

p.xaxis[0].formatter.days = ['%Hh']
p.x_range.range_padding = 0
p.ygrid.grid_line_color = None

show(p)

On tap, I expect the point under my mouse to highlight.

What happens is that a repaint occurs causing a fresh jitter so the higlighted point has moved. This is particularly clear if you tap on two points that were on top of each other but have now moved

[birdsarah]

all of our signals because they are kind of a rats nest at the moment.

there’s no need to talk smack about rats’ nests 😄

[bryevdv]

Since I think it’s the most common and cost effective, for now just got to get the cache on length for jitter done.