PR: Fix a couple of bugs in the statusbar

[steff456]

Description of Changes

• This fixes an error of the main window crashing when Kite is installed but not enabled.
• It also hides completion provider widgets if they are disabled.

Fixes #15322

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: Steff456

[steff456]

@impact27 can you please test this PR with your Spyder settings to see if this change fixes your issue?

[impact27]

It fixes the issue but the autocompletion/linting doesn't work.

[ccordoba12]

@impact27, that won't work because Spyder needs to be properly installed for our completion architecture to work now.

[impact27]

But couldn't there be a patch if spyder is not part of a proper distribution?
Like if in main() no distribution are detected, we could run:

def patch_spyder_completion():
    """Register completion providers if spyder is not part of a proper distribution."""
    fallback = pkg_resources.EntryPoint.parse(
        'fallback = spyder.plugins.completion.providers.fallback.provider:'
        'FallbackProvider')
    
    snippets = pkg_resources.EntryPoint.parse(
        'snippets = spyder.plugins.completion.providers.snippets.provider:'
        'SnippetsProvider'
    )
    
    lsp = pkg_resources.EntryPoint.parse(
        'lsp = spyder.plugins.completion.providers.languageserver.provider:'
        'LanguageServerProvider'
    )
    
    kite = pkg_resources.EntryPoint.parse(
        'kite = spyder.plugins.completion.providers.kite.provider:'
        'KiteProvider'
    )
    
    # Create a fake Spyder distribution
    d = pkg_resources.Distribution(__file__)
    
    # Add the providers to the fake EntryPoint
    d._ep_map = {
        'spyder.completions': {
            'fallback': fallback,
            'snippets': snippets,
            'lsp': lsp,
            'kite': kite
        }
    }
    
    # Add the fake distribution to the global working_set
    pkg_resources.working_set.add(d, 'spyder')

[impact27]

Or would that just work if I have a local copy of the git?

[impact27]

This works for me: #15382

[ccordoba12]

@steff456, if the the LSP provider is deactivated in preferences:

we still try to show its widget in the status bar:

The idea is to hide it when that provider is disabled. And please do the same for Kite.

[ccordoba12]

This looks pretty good @steff456, thanks!

[ccordoba12]

Thanks @steff456!