Ignore isHighlighted state for now, we need a design decision on it.

libraries/theme/src/main/kotlin/io/element/android/libraries/theme/ElementColors.kt

@@ -39,7 +39,6 @@ import io.element.android.libraries.theme.compound.generated.SemanticColors
 class ElementColors(
     messageFromMeBackground: Color,
     messageFromOtherBackground: Color,
-    messageHighlightedBackground: Color,
     quaternary: Color,
     quinary: Color,
     gray300: Color,
@@ -51,8 +50,6 @@ class ElementColors(
         private set
     var messageFromOtherBackground by mutableStateOf(messageFromOtherBackground)
         private set
-    var messageHighlightedBackground by mutableStateOf(messageHighlightedBackground)
-        private set
 
     var quaternary by mutableStateOf(quaternary)
         private set
@@ -75,7 +72,6 @@ class ElementColors(
     fun copy(
         messageFromMeBackground: Color = this.messageFromMeBackground,
         messageFromOtherBackground: Color = this.messageFromOtherBackground,
-        messageHighlightedBackground: Color = this.messageHighlightedBackground,
         quaternary: Color = this.quaternary,
         quinary: Color = this.quinary,
         gray300: Color = this.gray300,
@@ -85,7 +81,6 @@ class ElementColors(
     ) = ElementColors(
         messageFromMeBackground = messageFromMeBackground,
         messageFromOtherBackground = messageFromOtherBackground,
-        messageHighlightedBackground = messageHighlightedBackground,
         quaternary = quaternary,
         quinary = quinary,
         gray300 = gray300,
@@ -97,7 +92,6 @@ class ElementColors(
     fun updateColorsFrom(other: ElementColors) {
         messageFromMeBackground = other.messageFromMeBackground
         messageFromOtherBackground = other.messageFromOtherBackground
-        messageHighlightedBackground = other.messageHighlightedBackground
         quaternary = other.quaternary
         quinary = other.quinary
         gray300 = other.gray300
@@ -110,7 +104,6 @@ class ElementColors(
 internal fun elementColorsLight() = ElementColors(
     messageFromMeBackground = SystemGrey5Light,
     messageFromOtherBackground = SystemGrey6Light,
-    messageHighlightedBackground = Azure,
     quaternary = Gray_100,
     quinary = Gray_50,
     gray300 = LightDesignTokens.colorGray300,
@@ -122,7 +115,6 @@ internal fun elementColorsLight() = ElementColors(
 internal fun elementColorsDark() = ElementColors(
     messageFromMeBackground = SystemGrey5Dark,
     messageFromOtherBackground = SystemGrey6Dark,
-    messageHighlightedBackground = Azure,
     quaternary = Gray_400,
     quinary = Gray_450,
     gray300 = DarkDesignTokens.colorGray300,