Add comparison dropdown option back

Author: vaisest

src/Classes/ImportTab.lua

@@ -585,9 +585,9 @@ local ImportTabClass = newClass("ImportTab", "ControlHost", "Control", function(
 	self.controls.importCodeState.label = function()
 		return self.importCodeDetail or ""
 	end
-	self.controls.importCodeMode = new("DropDownControl", {"TOPLEFT",self.controls.importCodeIn,"BOTTOMLEFT"}, {0, 4, 160, 20}, { "Import to this build", "Import to a new build" })
+	self.controls.importCodeMode = new("DropDownControl", {"TOPLEFT",self.controls.importCodeIn,"BOTTOMLEFT"}, {0, 4, 200, 20}, { "Import to this build", "Import to a new build", "Import as comparison" })
 	self.controls.importCodeMode.enabled = function()
-		return self.build.dbFileName and self.importCodeValid
+		return (self.build.dbFileName or self.controls.importCodeMode.selIndex == 3) and self.importCodeValid
 	end
 	self.controls.importCodeGo = new("ButtonControl", {"LEFT",self.controls.importCodeMode,"RIGHT"}, {8, 0, 160, 20}, "Import", function()
 		if self.importCodeSite and not self.importCodeXML then