fix(editor): the tools see each change of the history by a revision of it, not by its size, which stood still once the oldest steps were dropped at the limit of 200 and came back to the same after an undo and another change: the SRK schematic, the lineside lists, the gauge, the joints, the speeds and the parallel track missed them

application/editormodesrk.h

@@ -74,7 +74,7 @@ class srk_tool final : public editor_tool
 	int m_record{-1}; // of the open station, -1 while it has none
 	TTrack *m_anchor{nullptr}; // the switch the open station was found from
 	bool m_reversed{false}; // the switches numbered from the right end of the schematic
-	std::size_t m_history_size{0};
+	std::size_t m_history_revision{0};
 	TTrack const *m_picked{nullptr}; // the track selected when the station was looked for
 	view m_view_state;
 	int m_hover{-1}; // path of the layout under the mouse in the schematic