add fix for cupertino & desktop

Author: EmreDET

lib/src/cupertino/cupertino_controls.dart

@@ -346,7 +346,8 @@ class _CupertinoControlsState extends State<CupertinoControls>
   }
 
   Widget _buildHitArea() {
-    final bool isFinished = _latestValue.position >= _latestValue.duration;
+    final bool isFinished = (_latestValue.position >= _latestValue.duration) &&
+        _latestValue.duration.inSeconds > 0;
     final bool showPlayButton =
         widget.showPlayButton && !_latestValue.isPlaying && !_dragging;
 
@@ -726,7 +727,8 @@ class _CupertinoControlsState extends State<CupertinoControls>
   }
 
   void _playPause() {
-    final isFinished = _latestValue.position >= _latestValue.duration;
+    final isFinished = _latestValue.position >= _latestValue.duration &&
+        _latestValue.duration.inSeconds > 0;
 
     setState(() {
       if (controller.value.isPlaying) {

lib/src/material/material_desktop_controls.dart

@@ -327,7 +327,8 @@ class _MaterialDesktopControlsState extends State<MaterialDesktopControls>
   }
 
   Widget _buildHitArea() {
-    final bool isFinished = _latestValue.position >= _latestValue.duration;
+    final bool isFinished = _latestValue.position >= _latestValue.duration &&
+        _latestValue.duration.inSeconds > 0;
     final bool showPlayButton =
         widget.showPlayButton && !_dragging && !notifier.hideStuff;