[views] Put the 'forgot password ?' link inside the LogForm

The old highjack of the LogFormView fails miserably when the bootstrap
cube is used.  Putting the link inside a fake FieldWidget inside the
form yields good results.  Closes #5190006.

views.py

@@ -21,15 +21,18 @@ _ = unicode
 # Login form
 # ----------
 
-class LogFormView(basetemplates.LogFormView):
-
-    def login_form(self, *args, **kwargs):
-        super(LogFormView, self).login_form(*args, **kwargs)
-        self.w(u'<span class="forgotpwdLink"><a href="%s">%s</a></span>' % (
-            xml_escape(self._cw.build_url('forgottenpassword',
-                                          base_url=self._cw.vreg.config['base-url'])),
-            self._cw._('Forgot your password?')))
-
+class ForgotPasswordLinkWidget(wdg.FieldWidget):
+    def render(self, form, field, renderer):
+        req = form._cw
+        ret = u'<span class="forgotpwdLink"><a href="%s">%s</a></span>' % (
+            xml_escape(req.build_url('forgottenpassword',
+                                     base_url=req.vreg.config['base-url'])),
+            req._('Forgot your password?'))
+        return ret
+
+basetemplates.LogForm.append_field(
+    ff.Field(name='__forgotpwd', label=None, widget=ForgotPasswordLinkWidget)
+    )
 
 # First form, send an email
 # -------------------------
@@ -186,10 +189,3 @@ class RegistrationSimpleReqRewriter(urlrewrite.SimpleReqRewriter):
         ('/pwdsent', dict(vid='pwdsent')),
         ('/pwdreset', dict(vid='pwdreset')),
         ]
-
-# Registration
-# ------------
-
-def registration_callback(vreg):
-    vreg.register_all(globals().values(), __name__, (LogFormView,))
-    vreg.register_and_replace(LogFormView, basetemplates.LogFormView)