syn summon using SynMix can be canceled (#2048)

utility.lua

@@ -508,6 +508,7 @@ function Auxiliary.SynMixTarget(f1,f2,f3,f4,minc,maxc,gc)
 					if max<maxc then maxc=max end
 					if minc>maxc then return false end
 				end
+				::SynMixTargetSelectStart::
 				local g=Group.CreateGroup()
 				local mg
 				local mgchk=false
@@ -518,16 +519,25 @@ function Auxiliary.SynMixTarget(f1,f2,f3,f4,minc,maxc,gc)
 					mg=Auxiliary.GetSynMaterials(tp,c)
 				end
 				if smat~=nil then mg:AddCard(smat) end
+				local c1
+				local c2
+				local c3
+				local cancel=Duel.IsSummonCancelable()
 				Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SMATERIAL)
-				local c1=mg:FilterSelect(tp,Auxiliary.SynMixFilter1,1,1,nil,f1,f2,f3,f4,minc,maxc,c,mg,smat,gc,mgchk):GetFirst()
+				c1=mg:Filter(Auxiliary.SynMixFilter1,nil,f1,f2,f3,f4,minc,maxc,c,mg,smat,gc,mgchk):SelectUnselect(g,tp,false,cancel,1,1)
+				if not c1 then return false end
 				g:AddCard(c1)
 				if f2 then
 					Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SMATERIAL)
-					local c2=mg:FilterSelect(tp,Auxiliary.SynMixFilter2,1,1,c1,f2,f3,f4,minc,maxc,c,mg,smat,c1,gc,mgchk):GetFirst()
+					c2=mg:Filter(Auxiliary.SynMixFilter2,g,f2,f3,f4,minc,maxc,c,mg,smat,c1,gc,mgchk):SelectUnselect(g,tp,false,cancel,1,1)
+					if not c2 then return false end
+					if g:IsContains(c2) then goto SynMixTargetSelectStart end
 					g:AddCard(c2)
 					if f3 then
 						Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SMATERIAL)
-						local c3=mg:FilterSelect(tp,Auxiliary.SynMixFilter3,1,1,Group.FromCards(c1,c2),f3,f4,minc,maxc,c,mg,smat,c1,c2,gc,mgchk):GetFirst()
+						c3=mg:Filter(Auxiliary.SynMixFilter3,g,f3,f4,minc,maxc,c,mg,smat,c1,c2,gc,mgchk):SelectUnselect(g,tp,false,cancel,1,1)
+						if not c3 then return false end
+						if g:IsContains(c3) then goto SynMixTargetSelectStart end
 						g:AddCard(c3)
 					end
 				end
@@ -535,20 +545,21 @@ function Auxiliary.SynMixTarget(f1,f2,f3,f4,minc,maxc,gc)
 				for i=0,maxc-1 do
 					local mg2=mg:Clone()
 					if f4 then
-						mg2=mg2:Filter(f4,g,c)
+						mg2=mg2:Filter(f4,g,c,c1,c2,c3)
 					else
 						mg2:Sub(g)
 					end
 					local cg=mg2:Filter(Auxiliary.SynMixCheckRecursive,g4,tp,g4,mg2,i,minc,maxc,c,g,smat,gc,mgchk)
 					if cg:GetCount()==0 then break end
-					local minct=1
-					if Auxiliary.SynMixCheckGoal(tp,g4,minc,i,c,g,smat,gc,mgchk) then
-						minct=0
-					end
+					local finish=Auxiliary.SynMixCheckGoal(tp,g4,minc,i,c,g,smat,gc,mgchk)
 					Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SMATERIAL)
-					local tg=cg:Select(tp,minct,1,nil)
-					if tg:GetCount()==0 then break end
-					g4:Merge(tg)
+					local c4=cg:SelectUnselect(g+g4,tp,finish,cancel,minc,maxc)
+					if not c4 then
+						if finish then break
+						else return false end
+					end
+					if g:IsContains(c4) or g4:IsContains(c4) then goto SynMixTargetSelectStart end
+					g4:AddCard(c4)
 				end
 				g:Merge(g4)
 				if g:GetCount()>0 then
@@ -595,11 +606,11 @@ function Auxiliary.SynMixFilter4(c,f4,minc,maxc,syncard,mg1,smat,c1,c2,c3,gc,mgc
 	if c3 then sg:AddCard(c3) end
 	local mg=mg1:Clone()
 	if f4 then
-		mg=mg:Filter(f4,sg,syncard)
+		mg=mg:Filter(f4,sg,syncard,c1,c2,c3)
 	else
 		mg:Sub(sg)
 	end
-	return aux.SynMixCheck(mg,sg,minc-1,maxc-1,syncard,smat,gc,mgchk)
+	return Auxiliary.SynMixCheck(mg,sg,minc-1,maxc-1,syncard,smat,gc,mgchk)
 end
 function Auxiliary.SynMixCheck(mg,sg1,minc,maxc,syncard,smat,gc,mgchk)
 	local tp=syncard:GetControler()