Update tags widget in Image and Douments forms.

AdminTagWidget provides initTagField function
that fixes issue with multiple-word tags.

wagtail/wagtaildocs/forms.py

@@ -1,5 +1,6 @@
 from django import forms
 
+from wagtail.wagtailadmin import widgets
 from wagtail.wagtaildocs.models import Document
 
 
@@ -10,5 +11,6 @@ class DocumentForm(forms.ModelForm):
         model = Document
         fields = ('title', 'file', 'tags')
         widgets = {
-            'file': forms.FileInput()
+            'file': forms.FileInput(),
+            'tags': widgets.AdminTagWidget,
         }

wagtail/wagtailimages/forms.py

@@ -2,6 +2,7 @@ from django import forms
 from django.forms.models import modelform_factory
 from django.utils.translation import ugettext as _
 
+from wagtail.wagtailadmin import widgets
 from wagtail.wagtailimages.formats import get_image_formats
 from wagtail.wagtailimages.fields import WagtailImageField
 
@@ -16,6 +17,7 @@ def formfield_for_dbfield(db_field, **kwargs):
     return db_field.formfield(**kwargs)
 
 
+
 def get_image_form(model):
     return modelform_factory(
         model,
@@ -25,6 +27,7 @@ def get_image_form(model):
         # so that when editing, we don't get the 'currently: ...' banner which is
         # a bit pointless here
         widgets={
+            'tags': widgets.AdminTagWidget,
             'file': forms.FileInput(),
             'focal_point_x': forms.HiddenInput(attrs={'class': 'focal_point_x'}),
             'focal_point_y': forms.HiddenInput(attrs={'class': 'focal_point_y'}),