[HDRP][Compositor] Fix color picker UI glitch in the Graphics Compositor

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed label style in pbr sky editor.
 - Fixed side effect on styles during compositor rendering.
 - Fixed size and spacing of compositor info boxes (case 1305652).
+- Fixed spacing of UI widgets in the Graphics Compositor (case 1305638).
 
 ### Changed
 - Change the source value for the ray tracing frame index iterator from m_FrameCount to the camera frame count (case 1301356).

com.unity.render-pipelines.high-definition/Editor/Compositor/CompositionManagerEditor.Styles.cs

@@ -23,6 +23,6 @@ static internal class CompositorStyle
         internal static readonly int k_ListItemPading = 4;
         internal static readonly int k_ListItemStackPading = 20;
         internal static readonly float k_SingleLineHeight = EditorGUIUtility.singleLineHeight;
-        internal static readonly float k_Spacing = k_SingleLineHeight * 1.1f;
+        internal static readonly float k_Spacing = k_SingleLineHeight + EditorGUIUtility.standardVerticalSpacing;
     }
 }