Allow drop key to work properly with side mouse buttons

src/main/java/club/sk1er/patcher/mixins/bugfixes/mousebindfix/GuiContainerMixin_MouseBindFix.java

@@ -2,18 +2,34 @@
 
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.gui.inventory.GuiContainer;
+import net.minecraft.inventory.Slot;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 @Mixin(GuiContainer.class)
 public abstract class GuiContainerMixin_MouseBindFix extends GuiScreen {
+    @Shadow
+    private Slot theSlot;
+
+    @Shadow
+    protected abstract void handleMouseClick(Slot par1, int par2, int par3, int par4);
+
     @Inject(method = "mouseClicked", at = @At("HEAD"), cancellable = true)
     private void patcher$checkCloseClick(int mouseX, int mouseY, int mouseButton, CallbackInfo ci) {
-        if (mouseButton - 100 == mc.gameSettings.keyBindInventory.getKeyCode()) {
+        int keyCode = mouseButton - 100;
+        if (keyCode == mc.gameSettings.keyBindInventory.getKeyCode()) {
             mc.thePlayer.closeScreen();
             ci.cancel();
         }
+        if (theSlot != null && theSlot.getHasStack()) {
+            if (keyCode == mc.gameSettings.keyBindPickBlock.getKeyCode()) {
+                handleMouseClick(theSlot, theSlot.slotNumber, 0, 3);
+            } else if (keyCode == mc.gameSettings.keyBindDrop.getKeyCode()) {
+                handleMouseClick(theSlot, theSlot.slotNumber, isCtrlKeyDown() ? 1 : 0, 4);
+            }
+        }
     }
 }