[ui] fix scaling when copying checkbox icons

When the JBCachingScalableIcon is copied for scaling,
the initial scale value must be propagated from the source icon via
JBScalableIcon#updateContextFrom. CheckboxIcon.WithColor did not have a
constructor that accepts the source icon, so copied instances could end up
with an incorrect size. This commit adds a constructor to CheckboxIcon.WithColor that takes source icon and allows to properly preserve the scale.

IJPL-225566

Author: juliabeliaeva

platform/platform-api/src/com/intellij/util/ui/CheckboxIcon.kt

@@ -46,10 +46,10 @@ object CheckboxIcon {
     get() = if (ExperimentalUI.isNewUI()) 4 else 0
 
 
-  class WithColor(private val size: Int, color: Color, arc: Int) : ColorIcon(size, size, size, size, color, false, arc) {
+  class WithColor : ColorIcon {
     private var mySizedIcon: SizedIcon
 
-    init {
+    constructor(size: Int, color: Color, arc: Int) : super(size, size, size, size, color, false, arc) {
       val icon = if (ExperimentalUI.isNewUI()) {
         IconUtil.resizeSquared(LafIconLookup.getIcon("checkmark", true), checkMarkSize)
       }
@@ -59,6 +59,10 @@ object CheckboxIcon {
       mySizedIcon = SizedIcon(icon, checkMarkSize, checkMarkSize)
     }
 
+    constructor(icon: WithColor) : super(icon) {
+      mySizedIcon = icon.mySizedIcon.copy()
+    }
+
     override fun withIconPreScaled(preScaled: Boolean): WithColor {
       mySizedIcon = mySizedIcon.withIconPreScaled(preScaled) as SizedIcon
       return super.withIconPreScaled(preScaled) as WithColor
@@ -72,7 +76,7 @@ object CheckboxIcon {
     }
 
     override fun copy(): ColorIcon {
-      return WithColor(size, iconColor, arcSize)
+      return WithColor(this)
     }
   }
 }