v3.0.0: fixed visual errors with spellbook spell icon alpha

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/windows/WndClericSpells.java

@@ -147,6 +147,14 @@ public class WndClericSpells extends Window {
 			addToBack(bg);
 		}
 
+		@Override
+		protected void onPointerUp() {
+			super.onPointerUp();
+			if (!tome.canCast(Dungeon.hero, spell)){
+				icon.alpha( 0.3f );
+			}
+		}
+
 		@Override
 		protected void layout() {
 			super.layout();