OSHelper: file preselection support (Windows and Mac)

Co-authored-by: selsta <selsta@sent.at>

src/qt/macoshelper.h

@@ -35,6 +35,7 @@ class MacOSHelper
 
 public:
     static bool isCapsLock();
+    static bool openFolderAndSelectItem(const QUrl &path);
 };
 
 #endif //MACOSHELPER_H

src/qt/macoshelper.mm

@@ -47,3 +47,11 @@ bool MacOSHelper::isCapsLock()
     return (flags & NSAlphaShiftKeyMask);
 #endif
 }
+
+bool MacOSHelper::openFolderAndSelectItem(const QUrl &path)
+{
+    NSURL *nspath = path.toNSURL();
+    NSArray *fileURLs = [NSArray arrayWithObjects:nspath, nil];
+    [[NSWorkspace sharedWorkspace] activateFileViewerSelectingURLs:fileURLs];
+    return true;
+}