Fix #2101116 [Match book on device: Tabbing doesn't select book](https://bugs.launchpad.net/calibre/+bug/2101116)

Author: kovidgoyal

src/calibre/gui2/dialogs/match_books.py

@@ -87,6 +87,7 @@ def __init__(self, gui, view, id_, row_index):
         self.books_table.setHorizontalHeaderItem(2, t)
         self.books_table_header_height = self.books_table.height()
         self.books_table.cellDoubleClicked.connect(self.book_doubleclicked)
+        self.books_table.selectionModel().selectionChanged.connect(self.selection_changed)
         self.books_table.cellClicked.connect(self.book_clicked)
         self.books_table.sortByColumn(0, Qt.SortOrder.AscendingOrder)
 
@@ -173,6 +174,12 @@ def resizeEvent(self, *args):
                 self.books_table.setColumnWidth(c, w)
         self.save_state()
 
+    def selection_changed(self):
+        x = self.books_table.selectedIndexes()
+        if x:
+            id_ = x[0].data(Qt.ItemDataRole.UserRole)
+            self.current_library_book_id = id_
+
     def book_clicked(self, row, column):
         self.book_selected = True
         id_ = int(self.books_table.item(row, 0).data(Qt.ItemDataRole.UserRole))