configurere-plugin is not working with debug=plugin option in .converagerc

[anetbnd]

Describe the bug
When you set the debug=plugin option inside your .coveragerc the configurer-plugin is not working anymore.
The reason is, that with debug=plugin the plugin is wrapped in the class DebugPluginWrapper. However, this wrapper is not passing through the call of the configure(...) method.

To Reproduce
File main.py:

import coverage           
cov = coverage.Coverage() 
cov.erase()
cov.start()               

print("I do nothing")

cov.stop()                
cov.save()    

File: configurer_plugin.py :

import coverage

class ConfigurerPlugin(coverage.CoveragePlugin):
    _executed = False
    
    def configure(self, config):
        self._executed = True
        
    def sys_info(self):
        return [('configure_was_executed', self._executed)]
        

def coverage_init(reg, options):
    reg.add_configurer(ConfigurerPlugin())

File: .coveragerc

[run]
debug=
    plugin
    sys
plugins=
    configurer_plugin

Then execute:
python main.py

The expected sys-debug output is:

-- sys -------------------------------------------------------
              version: 4.5.4
[...]
 plugins.file_tracers: -none-
  plugins.configurers: configurer_plugin.ConfigurerPlugin
         config_files: .coveragerc
         configs_read: .coveragerc
            data_path: c:\Projects\torch\patterns\coverage_plugin_issue\.coverage
               python: 3.7.3 (default, Apr 24 2019, 15:29:51) [MSC v.1915 64 bit (AMD64)]
             platform: Windows-10-10.0.15063-SP0
[...]
-- sys: configurer_plugin.ConfigurerPlugin -------------------
 configure_was_executed: True
-- end -------------------------------------------------------

This output, you will get by disabling the plugin option for debug in the .coveragerc. However, with the 4.5.4 version of coverage.py you only get:

-- sys -------------------------------------------------------
              version: 4.5.4
[...]
 plugins.file_tracers: -none-
  plugins.configurers: configurer_plugin.ConfigurerPlugin
         config_files: .coveragerc
         configs_read: .coveragerc
            data_path: c:\Projects\torch\patterns\coverage_plugin_issue\.coverage
               python: 3.7.3 (default, Apr 24 2019, 15:29:51) [MSC v.1915 64 bit (AMD64)]
             platform: Windows-10-10.0.15063-SP0
[...]
-- sys: configurer_plugin.ConfigurerPlugin -------------------
 configure_was_executed: False
-- end -------------------------------------------------------

My pip list says:

Package            Version
------------------ ---------
asciimatics        1.11.0
atomicwrites       1.3.0
attrs              19.1.0
certifi            2019.6.16
colorama           0.4.1
coverage           4.5.4
future             0.17.1
importlib-metadata 0.19
more-itertools     7.2.0
numpy              1.17.0
packaging          19.1
Pillow             6.1.0
pip                19.1.1
pluggy             0.12.0
pure-interface     3.5.2
py                 1.8.0
pyfiglet           0.8.post1
pyparsing          2.4.2
pypiwin32          223
pytest             5.0.1
pytest-cov         2.7.1
pytest-pythonpath  0.7.3
pywin32            224
setuptools         41.0.1
six                1.12.0
typing             3.7.4
wcwidth            0.1.7
wheel              0.33.4
wincertstore       0.2
zipp               0.5.2

[nedbat]

Thanks for the detailed issue. This is fixed in 48660ff

[anetbnd]

Thanks for fixing 👍

[nedbat]

This is in 5.0a7.