Disabled buttons should be gray by default #8717
Description
ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)
Python version : 3.6.8 |Anaconda, Inc.| (default, Dec 29 2018, 19:04:46)
IPython version : 7.1.1
Tornado version : 5.1.1
Bokeh version : 1.1.0dev8
BokehJS static path : /Users/jsignell/conda/envs/panel-dev/lib/python3.6/site-packages/bokeh/server/static
node.js version : v7.10.0
npm version : 4.2.0
Description of expected behavior and the observed behavior
Disabled buttons should be gray by default so that it is clear that they are disabled. Now it seems that button color gets muted when disabled which is fine unless the button background is white which it is by default.
I first brought up this issue here: holoviz/panel#275 where it's been noted that other widget behavior is similar.
Complete, minimal, self-contained example code that reproduces the issue
from bokeh.io import show
from bokeh.layouts import widgetbox
from bokeh.models.widgets import Button
button = Button(label="Foo", disabled=True)
show(widgetbox(button))Screenshots or screencasts of the bug in action
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