Create smandrap_Select previous track in TCP or in Mixer.lua

Navigation/smandrap_Select previous track in TCP or in Mixer.lua

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+local mixer_hwnd = reaper.JS_Window_Find("Mixer", true)
+local focus = reaper.JS_Window_GetParent(reaper.JS_Window_GetFocus())
+
+local function prev_in_mcp()
+  local first_sel_t = reaper.GetSelectedTrack(-1, 0) or reaper.GetLastTouchedTrack()
+  local id = 0
+
+  if first_sel_t then id = reaper.GetMediaTrackInfo_Value(first_sel_t, 'IP_TRACKNUMBER') end
+
+  for i = id -2, 0, -1 do
+    local t = reaper.GetTrack(-1, i)
+    if reaper.IsTrackVisible(t, true) then
+      reaper.SetOnlyTrackSelected(t)
+      return
+    end
+  end
+end
+
+
+if focus == mixer_hwnd then
+  reaper.Undo_BeginBlock()
+  prev_in_mcp()
+  reaper.Undo_EndBlock("Select Previous Track in Mixer", 0)
+else
+  reaper.Main_OnCommand(40286, 0)
+end