Make searching and tag filtering mutually exclusive at the view level
Make searching and tag filtering mutually exclusive at the view level

We can't guarantee that search backends are able to search on a queryset
that has been filtered by a relation such as tags (see #459). The JS code
currently avoids applying a tag filter and a search query at the same
time; this change makes that behaviour explicit at the view level too.

rsalmaso/wagtail,mikedingjan/wagtail,Toshakins/wagtail,davecranwell/wagtail,wagtail/wagtail,chrxr/wagtail,gasman/wagtail,nimasmi/wagtail,nimasmi/wagtail,rsalmaso/wagtail,gasman/wagtail,kurtw/wagtail,nilnvoid/wagtail,quru/wagtail,timorieber/wagtail,nilnvoid/wagtail,JoshBarr/wagtail,kurtw/wagtail,rsalmaso/wagtail,takeflight/wagtail,kurtw/wagtail,wagtail/wagtail,torchbox/wagtail,nutztherookie/wagtail,wagtail/wagtail,takeflight/wagtail,chrxr/wagtail,Toshakins/wagtail,nealtodd/wagtail,jnns/wagtail,nilnvoid/wagtail,thenewguy/wagtail,jnns/wagtail,nutztherookie/wagtail,gogobook/wagtail,zerolab/wagtail,hamsterbacke23/wagtail,nilnvoid/wagtail,gasman/wagtail,FlipperPA/wagtail,inonit/wagtail,zerolab/wagtail,nimasmi/wagtail,kaedroho/wagtail,hamsterbacke23/wagtail,kurtrwall/wagtail,iansprice/wagtail,iansprice/wagtail,jnns/wagtail,wagtail/wagtail,Toshakins/wagtail,gasman/wagtail,FlipperPA/wagtail,thenewguy/wagtail,FlipperPA/wagtail,kaedroho/wagtail,JoshBarr/wagtail,kaedroho/wagtail,torchbox/wagtail,kaedroho/wagtail,thenewguy/wagtail,mikedingjan/wagtail,inonit/wagtail,gogobook/wagtail,wagtail/wagtail,davecranwell/wagtail,Toshakins/wagtail,nealtodd/wagtail,torchbox/wagtail,rsalmaso/wagtail,takeflight/wagtail,torchbox/wagtail,mixxorz/wagtail,inonit/wagtail,mixxorz/wagtail,thenewguy/wagtail,nealtodd/wagtail,JoshBarr/wagtail,quru/wagtail,JoshBarr/wagtail,gogobook/wagtail,zerolab/wagtail,gogobook/wagtail,davecranwell/wagtail,kurtw/wagtail,takeflight/wagtail,kurtrwall/wagtail,chrxr/wagtail,timorieber/wagtail,kurtrwall/wagtail,quru/wagtail,hamsterbacke23/wagtail,nealtodd/wagtail,nimasmi/wagtail,timorieber/wagtail,rsalmaso/wagtail,mikedingjan/wagtail,iansprice/wagtail,mikedingjan/wagtail,inonit/wagtail,chrxr/wagtail,FlipperPA/wagtail,quru/wagtail,hamsterbacke23/wagtail,mixxorz/wagtail,jnns/wagtail,nutztherookie/wagtail,kaedroho/wagtail,mixxorz/wagtail,mixxorz/wagtail,thenewguy/wagtail,gasman/wagtail,timorieber/wagtail,iansprice/wagtail,zerolab/wagtail,kurtrwall/wagtail,nutztherookie/wagtail,zerolab/wagtail,davecranwell/wagtail