Change the Lexicon gui code to pull from the stack used to open the book. Closes #518

src/main/java/vazkii/botania/client/core/proxy/ClientProxy.java

@@ -221,6 +221,11 @@ public class ClientProxy extends CommonProxy {
 	public void setEntryToOpen(LexiconEntry entry) {
 		GuiLexicon.currentOpenLexicon = new GuiLexiconEntry(entry, new GuiLexiconIndex(entry.category));
 	}
+	
+	@Override
+	public void setLexiconStack(ItemStack stack) {
+		GuiLexicon.stackUsed = stack;
+	}
 
 	@Override
 	public boolean isTheClientPlayer(EntityLivingBase entity) {

src/main/java/vazkii/botania/client/gui/lexicon/GuiLexicon.java

@@ -69,7 +69,7 @@ public class GuiLexicon extends GuiScreen {
 
 		lastTime = ClientTickHandler.ticksInGame;
 
-		title = Minecraft.getMinecraft().thePlayer.getCurrentEquippedItem().getDisplayName();
+		title = stackUsed.getDisplayName();
 		currentOpenLexicon = this;
 
 		left = width / 2 - guiWidth / 2;

src/main/java/vazkii/botania/common/core/proxy/CommonProxy.java

@@ -13,6 +13,7 @@ package vazkii.botania.common.core.proxy;
 import net.minecraft.block.Block;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.MovingObjectPosition;
 import net.minecraft.world.World;
@@ -128,6 +129,10 @@ public class CommonProxy {
 	public void setEntryToOpen(LexiconEntry entry) {
 		// NO-OP
 	}
+	
+	public void setLexiconStack(ItemStack stack) {
+		// NO-OP
+	}
 
 	public boolean isTheClientPlayer(EntityLivingBase entity) {
 		return false;

src/main/java/vazkii/botania/common/item/ItemLexicon.java

@@ -65,6 +65,8 @@ public class ItemLexicon extends ItemMod implements ILexicon, IElvenItem {
 					LexiconEntry entry = ((ILexiconable) block).getEntry(par3World, par4, par5, par6, par2EntityPlayer, par1ItemStack);
 					if(entry != null && isKnowledgeUnlocked(par1ItemStack, entry.getKnowledgeType())) {
 						Botania.proxy.setEntryToOpen(entry);
+						Botania.proxy.setLexiconStack(par1ItemStack);
+
 						par2EntityPlayer.openGui(Botania.instance, LibGuiIDs.LEXICON, par3World, 0, 0, 0);
 						par2EntityPlayer.addStat(ModAchievements.lexiconUse, 1);
 						if(!par3World.isRemote)
@@ -136,6 +138,7 @@ public class ItemLexicon extends ItemMod implements ILexicon, IElvenItem {
 			setForcedPage(par1ItemStack, "");
 		}
 
+		Botania.proxy.setLexiconStack(par1ItemStack);
 		par3EntityPlayer.addStat(ModAchievements.lexiconUse, 1);
 		par3EntityPlayer.openGui(Botania.instance, LibGuiIDs.LEXICON, par2World, 0, 0, 0);
 		if(!par2World.isRemote && !skipSound)

src/main/java/vazkii/botania/common/network/GuiHandler.java

@@ -37,9 +37,6 @@ public class GuiHandler implements IGuiHandler {
 		switch(ID) {
 		case LibGuiIDs.LEXICON : {
 			GuiLexicon lex = GuiLexicon.currentOpenLexicon;
-			GuiLexicon.stackUsed = player.getCurrentEquippedItem();
-			if(GuiLexicon.stackUsed == null || !(GuiLexicon.stackUsed.getItem() instanceof ILexicon))
-				return null;
 			return lex;
 		}
 		case LibGuiIDs.CRAFTING_HALO : {