fix: use sheetParent for file panels opened from sheet-presented dialogs

Author: datlechin

TablePro/Views/Export/ExportDialog.swift

@@ -714,7 +714,8 @@ struct ExportDialog: View {
             savePanel.message = String(format: String(localized: "Export %d table(s) to %@"), exportableCount, formatName)
         }
 
-        guard let window = NSApp.keyWindow else { return }
+        guard let keyWindow = NSApp.keyWindow else { return }
+        let window = keyWindow.sheetParent ?? keyWindow
         savePanel.beginSheetModal(for: window) { response in
             guard response == .OK, let url = savePanel.url else { return }
 

TablePro/Views/Import/ImportDialog.swift

@@ -294,7 +294,8 @@ struct ImportDialog: View {
         panel.allowsMultipleSelection = false
         panel.message = "Select file to import"
 
-        guard let window = NSApp.keyWindow else { return }
+        guard let keyWindow = NSApp.keyWindow else { return }
+        let window = keyWindow.sheetParent ?? keyWindow
         panel.beginSheetModal(for: window) { response in
             guard response == .OK, let url = panel.url else { return }