Fix #696

Better fix that doesn't CME when entries with many pages are clicked too fast. Previous fix caused other buttons to still iterate after one was handled, rather than returning and just handling the last widget.

Xplat/src/main/java/vazkii/patchouli/client/book/gui/GuiBook.java

@@ -312,7 +312,15 @@ public boolean mouseClickedScaled(double mouseX, double mouseY, int mouseButton)
 		}
 		}
 
-		return super.mouseClicked(mouseX, mouseY, mouseButton);
+		for(GuiEventListener listener : children()) {
+			if (listener.mouseClicked(mouseX, mouseY, mouseButton)) {
+				if (mouseButton == GLFW.GLFW_MOUSE_BUTTON_LEFT) {
+					setDragging(true);
+				}
+				return true;
+			}
+		}
+		return false;
 	}
 
 	@Override