Add VideoClipPlaylist component for sequential gapless clip playback

Plays a list of items (clip + percentage range) on a VideoPlayer.
Double-buffers via a second player (auto-created child incl. AudioSource
copy) and drives the screen texture through a MaterialPropertyBlock,
flipping only once the next player delivers frames - no black/freeze gap.
Editor drawer renders each item as clip row + min-max percent range slider.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/Editor/VideoClipPlaylistItemDrawer.cs

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+using UnityEditor;
+using UnityEngine;
+
+/// <summary>
+/// Draws a <see cref="VideoClipPlaylist.Item"/> as two lines: the clip field and a
+/// percent min-max slider (stored normalized 0..1) selecting the played portion.
+/// </summary>
+[CustomPropertyDrawer(typeof(VideoClipPlaylist.Item))]
+public class VideoClipPlaylistItemDrawer : PropertyDrawer
+{
+    private const float PercentFieldWidth = 44f;
+    private const float Gap = 4f;
+
+    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+        => EditorGUIUtility.singleLineHeight * 2f + EditorGUIUtility.standardVerticalSpacing;
+
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+        SerializedProperty clipProp = property.FindPropertyRelative(nameof(VideoClipPlaylist.Item.clip));
+        SerializedProperty rangeProp = property.FindPropertyRelative(nameof(VideoClipPlaylist.Item.range));
+
+        EditorGUI.BeginProperty(position, label, property);
+
+        float line = EditorGUIUtility.singleLineHeight;
+        var clipRect = new Rect(position.x, position.y, position.width, line);
+        EditorGUI.PropertyField(clipRect, clipProp, label);
+
+        var rowRect = new Rect(position.x, clipRect.yMax + EditorGUIUtility.standardVerticalSpacing,
+            position.width, line);
+        Rect rangeRect = EditorGUI.PrefixLabel(rowRect, new GUIContent("Range (%)",
+            "Played portion of the clip in percent (start/end)."));
+
+        Vector2 range = rangeProp.vector2Value;
+        float min = Mathf.Round(range.x * 1000f) / 10f;
+        float max = Mathf.Round(range.y * 1000f) / 10f;
+
+        var minRect = new Rect(rangeRect.x, rangeRect.y, PercentFieldWidth, line);
+        var maxRect = new Rect(rangeRect.xMax - PercentFieldWidth, rangeRect.y, PercentFieldWidth, line);
+        var sliderRect = new Rect(minRect.xMax + Gap, rangeRect.y,
+            Mathf.Max(0f, rangeRect.width - 2f * (PercentFieldWidth + Gap)), line);
+
+        EditorGUI.BeginChangeCheck();
+        int indent = EditorGUI.indentLevel;
+        EditorGUI.indentLevel = 0; // fields inside the row must not re-indent
+        min = EditorGUI.FloatField(minRect, min);
+        EditorGUI.MinMaxSlider(sliderRect, ref min, ref max, 0f, 100f);
+        max = EditorGUI.FloatField(maxRect, max);
+        EditorGUI.indentLevel = indent;
+        if (EditorGUI.EndChangeCheck())
+        {
+            min = Mathf.Clamp(min, 0f, 100f);
+            max = Mathf.Clamp(max, min, 100f);
+            rangeProp.vector2Value = new Vector2(min / 100f, max / 100f);
+        }
+
+        EditorGUI.EndProperty();
+    }
+}

Assets/Scripts/Editor/VideoClipPlaylistItemDrawer.cs.meta

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+fileFormatVersion: 2
+guid: 7623ddbca00a62a4c8718ae46341b87a