Update ChoiceForm to be full height

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -146,6 +146,7 @@
 * Rename form template 'form_class' to 'form_css_classes'.
 * Add support for adding form button aside from the 
   default submit and cancel.
+* Update ChoiceForm to be full height.
 
 3.1.11 (2019-04-XX)
 ===================

docs/releases/3.2.rst

@@ -178,6 +178,7 @@ Other changes
 * Rename form template 'form_class' to 'form_css_classes'.    
 * Add support for adding form button aside from the
   default submit and cancel.
+* Update ChoiceForm to be full height.
 
 Removals
 --------

mayan/apps/common/forms.py

@@ -34,10 +34,14 @@ class ChoiceForm(forms.Form):
         self.fields['selection'].help_text = help_text
         self.fields['selection'].widget.disabled_choices = disabled_choices
         self.fields['selection'].widget.attrs.update(
-            {'size': 14, 'class': 'choice_form'}
+            {
+                'class': 'full-height', 'data-height-difference': '450'
+            }
         )
 
-    selection = forms.MultipleChoiceField(widget=DisableableSelectWidget())
+    selection = forms.MultipleChoiceField(
+        required=False, widget=DisableableSelectWidget()
+    )
 
 
 class FormOptions(object):