[Main] test_tags_dialog fails on Windows

[drew2a]

I saw random test_tags_dialog fails during the #6540

Full console

=================================== FAILURES ===================================
_______________________________ test_tags_dialog _______________________________

window = <tribler_gui.tribler_window.TriblerWindow object at 0x12f312790>

    def test_tags_dialog(window):
        """
        Test the behaviour of the dialog where a user can edit tags.
        """
        QTest.mouseClick(window.left_menu_button_popular, Qt.LeftButton)
        widget = window.popular_page
        wait_for_list_populated(widget.content_table)
    
        # Test the tag modification dialog
        idx = widget.content_table.model().index(0, 0)
        widget.content_table.on_edit_tags_clicked(idx)
        screenshot(window, name="edit_tags_dialog")
        assert widget.content_table.add_tags_dialog
        wait_for_signal(widget.content_table.add_tags_dialog.suggestions_loaded)
    
        # Edit the first tag
        tags_input = widget.content_table.add_tags_dialog.dialog_widget.edit_tags_input
        num_tags = len(tags_input.tags) - 1  # To account for the 'dummy' tag at the end of the input field.
        QTest.mouseClick(tags_input, Qt.LeftButton, pos=tags_input.tags[0].rect.center().toPoint())
        QTest.keyClick(tags_input, Qt.Key_Home)
        assert tags_input.editing_index == 0
        assert tags_input.cursor_ind == 0
        screenshot(window, name="edit_tags_dialog_edit_first_tag")
    
        # Test selecting a single character
        QTest.keyClick(tags_input, Qt.Key_Right)
        QTest.keySequence(tags_input, QKeySequence.SelectPreviousChar)
        assert tags_input.select_size == 1
        QTest.keySequence(tags_input, QKeySequence.SelectNextChar)
        screenshot(window, name="edit_tags_dialog_first_tag_partial_selection")
        assert tags_input.select_size == 1
    
        # Test navigating between the first and second tag using the keyboard buttons
        QTest.keyClick(tags_input, Qt.Key_Home)
        for _ in range(len(tags_input.tags[0].text) + 1):
            QTest.keyClick(tags_input, Qt.Key_Right)
    
        assert tags_input.editing_index == 1
        QTest.keyClick(tags_input, Qt.Key_Left)
        assert tags_input.editing_index == 0
    
        # Select all text of the first tag
        QTest.keySequence(tags_input, QKeySequence.SelectAll)
        screenshot(window, name="edit_tags_dialog_edit_first_tag_selected")
    
        # Remove the second tag
        cross_rect = tags_input.compute_cross_rect(tags_input.tags[1].rect)
        QTest.mouseClick(tags_input, Qt.LeftButton, pos=cross_rect.center().toPoint())
>       assert len(tags_input.tags) == num_tags - 1
E       assert 4 == 3
E         +4
E         -3

[devos50]

It looks to me like a race condition: the removal of the tag probably has not been fully processed before the assert is called. I will think of a solution to this.