Remove `Message.eq` override

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/At.kt

@@ -34,10 +34,6 @@ class At @MiraiInternalAPI constructor(val target: Long, val display: String) :
 
     companion object Key : Message.Key<At>
 
-    override fun eq(other: Message): Boolean {
-        return other is At && other.target == this.target
-    }
-
     // 自动为消息补充 " "
 
     override fun followedBy(tail: Message): MessageChain {

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Face.kt

@@ -167,8 +167,4 @@ class Face(val id: Int) : Message {
         const val shouqiang: Int = 169
         const val qingwa: Int = 170
     }
-
-    override fun eq(other: Message): Boolean {
-        return other is Face && other.id == this.id
-    }
 }
\ No newline at end of file

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Image.kt

@@ -49,11 +49,6 @@ sealed class Image : Message {
     final override fun toString(): String {
         return "[mirai:$imageId]"
     }
-
-    final override fun eq(other: Message): Boolean {
-        return if (other is Image) return other.imageId == this.imageId
-        else this.toString() == other.toString()
-    }
 }
 
 abstract class CustomFace : Image() {

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageChain.kt

@@ -57,12 +57,6 @@ interface MessageChain : Message, MutableList<Message> {
      * @param key 由各个类型消息的伴生对象持有. 如 [PlainText.Key]
      */
     operator fun <M : Message> get(key: Message.Key<M>): M = first(key)
-
-    override fun eq(other: Message): Boolean {
-        if (other is MessageChain && other.size != this.size)
-            return false
-        return this.toString() == other.toString()
-    }
 }
 
 /**

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/PlainText.kt

@@ -25,13 +25,6 @@ inline class PlainText(val stringValue: String) : Message {
     override fun toString(): String = stringValue
 
     companion object Key : Message.Key<PlainText>
-
-    override fun eq(other: Message): Boolean {
-        if (other is MessageChain) {
-            return other eq this.toString()
-        }
-        return other is PlainText && other.stringValue == this.stringValue
-    }
 }
 
 /**

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/XML.kt

@@ -27,10 +27,6 @@ inline class XMLMessage(val stringValue: String) : Message,
     SingleOnly {
     override fun followedBy(tail: Message): Nothing = error("XMLMessage Message cannot be followed")
     override fun toString(): String = stringValue
-
-    override fun eq(other: Message): Boolean {
-        return other is XMLMessage && other.stringValue == this.stringValue
-    }
 }
 
 /**