changes in AppBar

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/helpers/AppBarTitle.kt

@@ -24,10 +24,14 @@ fun AppBarTitle(
   bottomPadding: Dp = DEFAULT_PADDING * 1.5f + 8.dp,
   enableAlphaChanges: Boolean = true
 ) {
-  val handler = if (enableAlphaChanges) LocalAppBarHandler.current else null
-  val connection = handler?.connection
+  val handler = LocalAppBarHandler.current
+  val connection = if (enableAlphaChanges) handler?.connection else null
   LaunchedEffect(title) {
-    handler?.title?.value = title
+    if (enableAlphaChanges) {
+      handler?.title?.value = title
+    } else {
+      handler?.connection?.scrollTrackingEnabled = false
+    }
   }
   val theme = CurrentColors.collectAsState()
   val titleColor = MaterialTheme.appColors.title
@@ -60,7 +64,8 @@ fun AppBarTitle(
 }
 
 private fun bottomTitleAlpha(connection: CollapsingAppBarNestedScrollConnection?) =
-  if ((connection?.appBarOffset ?: 0f).absoluteValue < AppBarHandler.appBarMaxHeightPx / 3) 1f
+  if (connection?.scrollTrackingEnabled == false) 1f
+  else if ((connection?.appBarOffset ?: 0f).absoluteValue < AppBarHandler.appBarMaxHeightPx / 3) 1f
   else ((AppBarHandler.appBarMaxHeightPx) + (connection?.appBarOffset ?: 0f) / 1.5f).coerceAtLeast(0f) / AppBarHandler.appBarMaxHeightPx
 
 @Composable

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/helpers/CollapsingAppBar.kt

@@ -84,6 +84,7 @@ class AppBarHandler(
 }
 
 class CollapsingAppBarNestedScrollConnection(): NestedScrollConnection {
+  var scrollTrackingEnabled = true
   var appBarOffset: Float by mutableFloatStateOf(0f)
 
   override fun onPreScroll(available: Offset, source: NestedScrollSource): Offset {

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/helpers/DefaultTopAppBar.kt

@@ -258,7 +258,8 @@ private fun AppBarCenterAligned(
 }
 
 private fun topTitleAlpha(text: Boolean, connection: CollapsingAppBarNestedScrollConnection, alpha: Float = appPrefs.inAppBarsAlpha.get()) =
-  if (connection.appBarOffset.absoluteValue < AppBarHandler.appBarMaxHeightPx / 3) 0f
+  if (!connection.scrollTrackingEnabled) 0f
+  else if (connection.appBarOffset.absoluteValue < AppBarHandler.appBarMaxHeightPx / 3) 0f
   else ((-connection.appBarOffset * 1.5f) / (AppBarHandler.appBarMaxHeightPx)).coerceIn(0f, if (text) 1f else alpha)
 
 val AppBarHeight = 56.dp