Add loading_indicator to global config

[MarcSkovMadsen]

Closes #4258

[codecov]

Codecov Report

Merging #4259 (1c18c5b) into main (ff8037e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4259      +/-   ##
==========================================
+ Coverage   82.71%   82.73%   +0.01%     
==========================================
  Files         237      237              
  Lines       34283    34320      +37     
==========================================
+ Hits        28358    28395      +37     
  Misses       5925     5925              

Flag	Coverage Δ
ui-tests	37.95% <34.14%> (-0.01%)	⬇️
unitexamples-tests	73.92% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
panel/config.py	60.31% <100.00%> (+0.10%)	⬆️
panel/param.py	86.68% <100.00%> (+0.23%)	⬆️
panel/tests/test_param.py	99.69% <100.00%> (+0.01%)	⬆️
panel/io/state.py	70.37% <0.00%> (-0.18%)	⬇️

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[MarcSkovMadsen]

This app can be used for manual testing

import time

import param

import panel as pn

pn.extension(loading_indicator=True)

class App(param.Parameterized):
    run = param.Event()
    clicks = param.Integer(-1)

    @pn.depends("run")
    def click_view(self):
        self.clicks+=1
        time.sleep(0.5)
        return f"Clicked {self.clicks} times"

app=App()
pn.Column(app.param.run, app.click_view).servable()

Assets

loading-indicator.mp4

[philippjfr]

Looks great, thank you!