chore: License and FIXME note

presentation/core/src/main/java/yokai/presentation/core/Scrollbar.kt

@@ -1,5 +1,36 @@
 package yokai.presentation.core
 
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Albert Chang
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * Code taken from https://gist.github.com/mxalbert1996/33a360fcab2105a31e5355af98216f5a
+ * with some modifications to handle contentPadding.
+ *
+ * Modifiers for regular scrollable list is omitted.
+ */
+
 import android.view.ViewConfiguration
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.tween
@@ -39,6 +70,8 @@ import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.sample
 import yokai.presentation.core.components.Scroller.STICKY_HEADER_KEY_PREFIX
 
+// FIXME: Scrollbar won't show up when TopAppBar is expanding/collapsing
+
 /**
  * Draws horizontal scrollbar to a LazyList.
  *