fix: fix registration of config item defaults

Before this patch, because of the "(:<name>)?", all registered
patterns would match and the default value would not be the one we
thought we had registered (maybe it just took the default value for
the first match?). This didn't matter because we didn't care about the
default value; we used our own, intended default value in getfixers()
anyway.

We also have to look up each config item individually in order to not
get developer warnings.

Differential Revision: https://phab.mercurial-scm.org/D7082

hgext/fix.py

@@ -178,7 +178,7 b' FIXER_ATTRS = {'
 }
 
 for key, default in FIXER_ATTRS.items():
-    configitem(b'fix', b'.*(:%s)?' % key, default=default, generic=True)
+    configitem(b'fix', b'.*:%s$' % key, default=default, generic=True)
 
 # A good default size allows most source code files to be fixed, but avoids
 # letting fixer tools choke on huge inputs, which could be surprising to the
@@ -794,12 +794,11 b' def getfixers(ui):'
     fixers = {}
     for name in fixernames(ui):
         fixers[name] = Fixer()
-        attrs = ui.configsuboptions(b'fix', name)[1]
         for key, default in FIXER_ATTRS.items():
             setattr(
                 fixers[name],
                 pycompat.sysstr(b'_' + key),
-                attrs.get(key, default),
+                ui.config(b'fix', name + b':' + key, default),
             )
         fixers[name]._priority = int(fixers[name]._priority)
         fixers[name]._metadata = stringutil.parsebool(fixers[name]._metadata)