macosx: Add method in stack to get the relevant nav state for a given input node

Signed-off-by: Claudio Cambra <developer@claudiocambra.com>

modules/gui/macosx/library/media-source/VLCLibraryMediaSourceViewNavigationStack.h

@@ -26,6 +26,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @class VLCLibraryWindow;
 @class VLCMediaSourceBaseDataSource;
+@class VLCLibraryMediaSourceViewNavigationState;
+
+typedef struct input_item_node_t input_item_node_t;
 
 @interface VLCLibraryMediaSourceViewNavigationStack : NSObject
 
@@ -39,6 +42,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)appendCurrentLibraryState;
 - (void)clear;
+- (nullable VLCLibraryMediaSourceViewNavigationState *)stateForNode:(input_item_node_t *)node;
 
 @end
 

modules/gui/macosx/library/media-source/VLCLibraryMediaSourceViewNavigationStack.m

@@ -202,4 +202,12 @@
     [self updateDelegateNavigationButtons];
 }
 
+- (nullable VLCLibraryMediaSourceViewNavigationState *)stateForNode:(input_item_node_t *)node
+{
+    const NSUInteger index = [_navigationStates indexOfObjectPassingTest:^BOOL(VLCLibraryMediaSourceViewNavigationState * const _Nonnull obj, const NSUInteger idx, BOOL * const _Nonnull stop) {
+        return obj.currentNodeDisplayed.vlcInputItemNode == node;
+    }];
+    return index == NSNotFound ? nil : _navigationStates[index];
+}
+
 @end