[FIX] ir.qweb: branding breaks editing/inheritance
[FIX] ir.qweb: branding breaks editing/inheritance

Could not edit t-field content if modified by inherit xpath,
and could not inherit qweb views with non "xpath" nodes with
`position="attributes"`.

Examples:
Can't edit: `<data><xpath expr="div[@t-field='object.test']"
position="replace"><div t-field="object.test"/></xpath></data>`

Inherit doesn't work: `<data><h1 position="replace"/><h1
class="test">tata</h1></data>`

Closes #11561
Closes #11547

storm-computers/odoo,grap/OpenUpgrade,OpenUpgrade/OpenUpgrade,Endika/odoo,jfpla/odoo,ygol/odoo,sysadminmatmoz/OCB,hassoon3/odoo,spadae22/odoo,alexcuellar/odoo,alexcuellar/odoo,Endika/OpenUpgrade,shingonoide/odoo,storm-computers/odoo,OpenUpgrade/OpenUpgrade,mustafat/odoo-1,mustafat/odoo-1,Endika/OpenUpgrade,Noviat/odoo,odootr/odoo,Noviat/odoo,Noviat/odoo,eino-makitalo/odoo,factorlibre/OCB,ygol/odoo,funkring/fdoo,Nowheresly/odoo,storm-computers/odoo,markeTIC/OCB,factorlibre/OCB,Endika/OpenUpgrade,odootr/odoo,datenbetrieb/odoo,ehirt/odoo,hassoon3/odoo,factorlibre/OCB,sysadminmatmoz/OCB,NeovaHealth/odoo,Endika/odoo,alexcuellar/odoo,glovebx/odoo,jfpla/odoo,Adel-Magebinary/odoo,tvibliani/odoo,Daniel-CA/odoo,factorlibre/OCB,Adel-Magebinary/odoo,laslabs/odoo,jfpla/odoo,diagramsoftware/odoo,ygol/odoo,vnsofthe/odoo,leorochael/odoo,diagramsoftware/odoo,Daniel-CA/odoo,BT-rmartin/odoo,NeovaHealth/odoo,glovebx/odoo,grap/OpenUpgrade,makinacorpus/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,alexcuellar/odoo,mustafat/odoo-1,mustafat/odoo-1,makinacorpus/odoo,synconics/odoo,laslabs/odoo,provaleks/o8,BT-ojossen/odoo,sysadminmatmoz/OCB,alexcuellar/odoo,markeTIC/OCB,spadae22/odoo,Daniel-CA/odoo,Elico-Corp/odoo_OCB,Nowheresly/odoo,CatsAndDogsbvba/odoo,Endika/OpenUpgrade,NeovaHealth/odoo,mustafat/odoo-1,tvibliani/odoo,OpenUpgrade/OpenUpgrade,CatsAndDogsbvba/odoo,Endika/odoo,Endika/OpenUpgrade,Noviat/odoo,BT-rmartin/odoo,ehirt/odoo,funkring/fdoo,tvibliani/odoo,BT-ojossen/odoo,Nowheresly/odoo,hassoon3/odoo,Daniel-CA/odoo,markeTIC/OCB,vnsofthe/odoo,jiangzhixiao/odoo,Adel-Magebinary/odoo,bplancher/odoo,NeovaHealth/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,datenbetrieb/odoo,makinacorpus/odoo,bplancher/odoo,grap/OpenUpgrade,bplancher/odoo,Elico-Corp/odoo_OCB,vnsofthe/odoo,datenbetrieb/odoo,Adel-Magebinary/odoo,provaleks/o8,provaleks/o8,dfang/odoo,alexcuellar/odoo,OpenUpgrade/OpenUpgrade,ehirt/odoo,alexcuellar/odoo,funkring/fdoo,hassoon3/odoo,microcom/odoo,shingonoide/odoo,BT-rmartin/odoo,jiangzhixiao/odoo,Nowheresly/odoo,CatsAndDogsbvba/odoo,glovebx/odoo,ehirt/odoo,synconics/odoo,sysadminmatmoz/OCB,jfpla/odoo,leorochael/odoo,grap/OpenUpgrade,Elico-Corp/odoo_OCB,diagramsoftware/odoo,sysadminmatmoz/OCB,factorlibre/OCB,funkring/fdoo,CatsAndDogsbvba/odoo,datenbetrieb/odoo,datenbetrieb/odoo,microcom/odoo,Adel-Magebinary/odoo,ygol/odoo,grap/OpenUpgrade,NeovaHealth/odoo,vnsofthe/odoo,microcom/odoo,sysadminmatmoz/OCB,tvibliani/odoo,makinacorpus/odoo,eino-makitalo/odoo,dfang/odoo,leorochael/odoo,shingonoide/odoo,Nowheresly/odoo,Elico-Corp/odoo_OCB,shingonoide/odoo,Endika/odoo,Noviat/odoo,synconics/odoo,factorlibre/OCB,BT-ojossen/odoo,jfpla/odoo,hip-odoo/odoo,markeTIC/OCB,bplancher/odoo,laslabs/odoo,microcom/odoo,ygol/odoo,Endika/OpenUpgrade,Noviat/odoo,jfpla/odoo,Endika/odoo,glovebx/odoo,leorochael/odoo,spadae22/odoo,grap/OpenUpgrade,Nowheresly/odoo,jiangzhixiao/odoo,tvibliani/odoo,spadae22/odoo,BT-ojossen/odoo,eino-makitalo/odoo,tvibliani/odoo,laslabs/odoo,BT-rmartin/odoo,Elico-Corp/odoo_OCB,vnsofthe/odoo,sysadminmatmoz/OCB,factorlibre/OCB,bplancher/odoo,datenbetrieb/odoo,provaleks/o8,Endika/OpenUpgrade,diagramsoftware/odoo,ehirt/odoo,synconics/odoo,vnsofthe/odoo,shingonoide/odoo,microcom/odoo,Daniel-CA/odoo,odootr/odoo,eino-makitalo/odoo,storm-computers/odoo,BT-rmartin/odoo,NeovaHealth/odoo,laslabs/odoo,dfang/odoo,BT-rmartin/odoo,hip-odoo/odoo,synconics/odoo,Daniel-CA/odoo,odootr/odoo,BT-ojossen/odoo,CatsAndDogsbvba/odoo,eino-makitalo/odoo,glovebx/odoo,mustafat/odoo-1,leorochael/odoo,markeTIC/OCB,spadae22/odoo,makinacorpus/odoo,dfang/odoo,BT-ojossen/odoo,glovebx/odoo,Adel-Magebinary/odoo,ygol/odoo,funkring/fdoo,microcom/odoo,makinacorpus/odoo,glovebx/odoo,CatsAndDogsbvba/odoo,shingonoide/odoo,funkring/fdoo,eino-makitalo/odoo,shingonoide/odoo,hip-odoo/odoo,jiangzhixiao/odoo,Daniel-CA/odoo,synconics/odoo,odootr/odoo,dfang/odoo,makinacorpus/odoo,jfpla/odoo,ehirt/odoo,provaleks/o8,grap/OpenUpgrade,diagramsoftware/odoo,Nowheresly/odoo,OpenUpgrade/OpenUpgrade,storm-computers/odoo,OpenUpgrade/OpenUpgrade,odootr/odoo,NeovaHealth/odoo,mustafat/odoo-1,synconics/odoo,hassoon3/odoo,hassoon3/odoo,CatsAndDogsbvba/odoo,diagramsoftware/odoo,diagramsoftware/odoo,odootr/odoo,markeTIC/OCB,provaleks/o8,leorochael/odoo,spadae22/odoo,Endika/odoo,datenbetrieb/odoo,eino-makitalo/odoo,jiangzhixiao/odoo,BT-ojossen/odoo,Adel-Magebinary/odoo,tvibliani/odoo,ygol/odoo,jiangzhixiao/odoo,bplancher/odoo,Endika/odoo,jiangzhixiao/odoo,funkring/fdoo,laslabs/odoo,storm-computers/odoo,Noviat/odoo,ehirt/odoo,vnsofthe/odoo,leorochael/odoo,spadae22/odoo,provaleks/o8,BT-rmartin/odoo,OpenUpgrade/OpenUpgrade,markeTIC/OCB