Avoid reapplying active loadout sets

Only switch tree, item, skill, and config sets when the selected loadout
uses a different set from the currently active one.

This restores the previous loadout switching behaviour and prevents build
initialisation from reprocessing stale tab state from the prior build,
which caused the test suite to fail when resetting between skill tests.

Author: LocalIdentity

src/Modules/Build.lua

@@ -939,10 +939,18 @@ function buildMode:SetActiveLoadout(loadout)
 		return
 	end
 
-	self.treeTab:SetActiveSpec(newSpecId, true)
-	self.itemsTab:SetActiveItemSet(newItemId, true)
-	self.skillsTab:SetActiveSkillSet(newSkillId, true)
-	self.configTab:SetActiveConfigSet(newConfigId, false, true)
+	if newSpecId ~= self.treeTab.activeSpec then
+		self.treeTab:SetActiveSpec(newSpecId, true)
+	end
+	if newItemId ~= self.itemsTab.activeItemSetId then
+		self.itemsTab:SetActiveItemSet(newItemId, true)
+	end
+	if newSkillId ~= self.skillsTab.activeSkillSetId then
+		self.skillsTab:SetActiveSkillSet(newSkillId, true)
+	end
+	if newConfigId ~= self.configTab.activeConfigSetId then
+		self.configTab:SetActiveConfigSet(newConfigId, false, true)
+	end
 	self:SyncLoadouts()
 end