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front end - Strange caching of Palette's TaggingRules


Please follow those steps to get the idea about the problem:




  1. Let's create a palette:


    nb = CreatePalette[
       DynamicModule[{},
        Panel["Hello you!", ImageSize -> 500, Alignment -> Center]

        ,
        SynchronousInitialization -> False,
        Initialization :> (
          CreateDocument@CurrentValue[EvaluationNotebook[], TaggingRules]
        )
       ],
       WindowTitle -> "Palette B ",
       TaggingRules -> {"B" -> 1123}
    ];



  2. And save it to users palettes directory.


    palettePath = FileNameJoin[{$UserBaseDirectory, "SystemFiles", 
        "FrontEnd", "Palettes", "TESTPalette.nb"}];

    NotebookSave[  nb,   palettePath   ];
    NotebookClose @ nb;


  3. Reset menus to show it there:



    MathLink`CallFrontEnd[ FrontEnd`ResetMenusPacket[{Automatic, Automatic}]]


    enter image description here





  4. Click on the item or run FrontEndTokenExecute["OpenFromPalettesMenu", FileNameTake @ palettePath] and we have it working:



    enter image description here






  5. Close the palette and delete it.


    DeleteFile @ palettePath


  6. Repeat steps 1-4 with different TaggingRules


     WindowTitle -> "Palette A",
     TaggingRules -> {"A" -> 1112}



The problem


Now there is a new Palette's Menu item - "Palette A" - and that notebook is opened when clicked, yet the old TaggingRules with "B" are prompted...



enter image description here





  • But the file is saved correctly:



    FilePrint @ palettePath

    shows that there is "A" inside TaggingRules. So "B" was somehow, cached somewhere.




  • Also, when one opens the notebook manually or with NotebookOpen @ paletePath it works well...




  • The problem remains after restarting Mathematica.





  • The SynchronousInitialization option is necessary, I wasn't able to reproduce the problem without it.




What is going on and how to deal with this?



Answer



As noted by ilian, this behaviour is explained in StoringAndTrackingPaletteStates tutorial.


Shortly, CurrentValue[$FrontEnd, System`PalettesMenuSettings] keeps those values cached.


In order to achieve what I described in the question we have to drop an entry that coresponds to our palette.


It doesn't really matter when it's done. Just do it before you need it to work :)



CurrentValue[$FrontEnd, System`PalettesMenuSettings] = DeleteCases[
  CurrentValue[$FrontEnd, System`PalettesMenuSettings],
  FileNameTake[palettePath] -> _
]

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