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Then if one of the classes that inherit HotSpot need to reimplement an input event, it can do so. I think this way we get less code duplication, and if we need to change those methods, there is a chance only changing the base implementation is necessary. This also fixes file filter. Initialise member variables in FilterChain ctor, particularly initialising _showUrlHint prevents an issue where url hints are displayed when moving the mouse for the first time in a newly opened konsole window even if no url hint modifiers are pressed. In keyPressEvent it seems calling update() on the TerminalDisplay isn't needed.
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