VisualInstructionDelegate method calls fix (#4820)

* NAVIOS-2142-delegate-calls: added checks to avoid unnecessary calls; CHANGELOG udpated

Author: Udumft

CHANGELOG.md

@@ -9,12 +9,14 @@
 ### Other changes
 
 * Added `RouteControllerNotificationUserInfoKey.shouldPlayRerouteSoundKey` to the user info dictionary of `Notification.Name.routeControllerDidReroute` notification. ([#4822](https://github.com/mapbox/mapbox-navigation-ios/pull/4822))
+* Fixed a bug with excessive `VisualInstructionDelegate.label(_:willPresent:as:)` delegate method call during initialization.
 
 ## v2.20.4
 
 ### Other changes
 
 * Reroute notification sound now plays only after a new route is successfully retrieved.
+* Fixed a bug with excessive `VisualInstructionDelegate.label(_:willPresent:as:)` delegate method call during initialization.
 
 ## v2.20.3
 

Sources/MapboxNavigation/StylableLabel.swift

@@ -7,24 +7,28 @@ open class StylableLabel: UILabel {
     // Workaround the fact that UILabel properties are not marked with UI_APPEARANCE_SELECTOR.
     @objc dynamic open var normalTextColor: UIColor = .black {
         didSet {
+            guard normalTextColor != oldValue else { return }
             update()
         }
     }
 
     @objc dynamic open var normalFont: UIFont = .systemFont(ofSize: 16) {
         didSet {
+            guard normalFont != oldValue else { return }
             update()
         }
     }
 
     @objc dynamic public var textColorHighlighted: UIColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1) {
         didSet {
+            guard textColorHighlighted != oldValue else { return }
             update()
         }
     }
 
     @objc public var showHighlightedTextColor: Bool = false {
         didSet {
+            guard showHighlightedTextColor != oldValue else { return }
             update()
         }
     }