VerticalListInlayPresentation: simplify size tracking

GitOrigin-RevId: 31eee7ab77e90e5a51fc20dcadcd43fa64f74de1

platform/lang-impl/src/com/intellij/codeInsight/hints/presentation/VerticalListInlayPresentation.kt

@@ -1,7 +1,6 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.codeInsight.hints.presentation
 
-import com.intellij.codeInsight.hints.dimension
 import com.intellij.openapi.editor.markup.TextAttributes
 import java.awt.Dimension
 import java.awt.Graphics2D
@@ -20,14 +19,15 @@ class VerticalListInlayPresentation(
   val presentations: List<InlayPresentation>
 ) : BasePresentation() {
   override var width: Int = 0
+    get() = presentations.maxByOrNull { it.width }!!.width
     private set
   override var height: Int = 0
+    get() = presentations.sumOf { it.height }
     private set
 
   private var presentationUnderCursor: InlayPresentation? = null
 
   init {
-    calcDimensions()
     for (presentation in presentations) {
       presentation.addListener(InternalListener(presentation))
     }
@@ -63,13 +63,6 @@ class VerticalListInlayPresentation(
     changePresentationUnderCursor(null)
   }
 
-  fun calcDimensions() {
-    width = presentations.maxByOrNull { it.width }!!.width
-    height = presentations.sumOf { it.height }
-  }
-
-
-
   private fun handleMouse(
     original: Point,
     action: (InlayPresentation, Point) -> Unit
@@ -111,10 +104,7 @@ class VerticalListInlayPresentation(
     }
 
     override fun sizeChanged(previous: Dimension, current: Dimension) {
-      val old = dimension()
-      calcDimensions()
-      val new = dimension()
-      this@VerticalListInlayPresentation.fireSizeChanged(old, new)
+      this@VerticalListInlayPresentation.fireSizeChanged(previous, current)
     }
 
     private fun shiftOfCurrent(): Int {