WIP: preview from empty search with space

sources/clipbored/views/ClipboardPanelController.swift

@@ -339,6 +339,16 @@ final class ClipboardPanelController: NSObject, NSWindowDelegate, QLPreviewPanel
     removeKeyMonitor()
     keyMonitor = NSEvent.addLocalMonitorForEvents(matching: .keyDown) { [weak self] event in
       guard let self else { return event }
+      if self.shouldHandlePanelKeyEvent(event, allowSearchFieldEditing: true),
+         self.panelView.isSearchFieldEditing,
+         Self.searchFieldPreviewShortcut(
+           forKeyCode: event.keyCode,
+           modifiers: event.modifierFlags,
+           searchText: self.panelView.searchTextForKeyboardShortcut
+         ) {
+        self.previewSelected()
+        return nil
+      }
       if self.shouldHandlePanelKeyEvent(event, allowSearchFieldEditing: true),
          let index = Self.quickPasteIndex(forKeyCode: event.keyCode, modifiers: event.modifierFlags) {
         self.viewModel.pasteItem(at: index)
@@ -469,6 +479,11 @@ final class ClipboardPanelController: NSObject, NSWindowDelegate, QLPreviewPanel
     return collectionShortcuts[keyCode]
   }
 
+  static func searchFieldPreviewShortcut(forKeyCode keyCode: UInt16, modifiers: NSEvent.ModifierFlags, searchText: String) -> Bool {
+    let relevantModifiers = modifiers.intersection(.deviceIndependentFlagsMask)
+    return keyCode == 49 && relevantModifiers.isEmpty && searchText.clipboardTrimmed.isEmpty
+  }
+
   static func commandShortcutAction(forKeyCode keyCode: UInt16, modifiers: NSEvent.ModifierFlags) -> ClipboardPanelShortcutAction? {
     let relevantModifiers = modifiers.intersection(.deviceIndependentFlagsMask)
     guard relevantModifiers == .command else { return nil }

sources/clipbored/views/ClipboardPanelView.swift

@@ -1102,6 +1102,10 @@ final class ClipboardPanelView: NSVisualEffectView, NSSearchFieldDelegate {
     return false
   }
 
+  var searchTextForKeyboardShortcut: String {
+    searchField.stringValue
+  }
+
   override func acceptsFirstMouse(for event: NSEvent?) -> Bool {
     return true
   }