[JW Lua] Measure width in score changes when measure width in a part is changed after Undo/Redo

[Robert Patterson]

This is a bug in Finale. I doubt it will be fixed. But you could send it to
them if you wish.

On Wed, Apr 3, 2024 at 7:53 AM Jan Angermüller <jan at angermueller.com> wrote:

> Robert,
>
> I have noticed several times that undo-ing and re-doing a JW Lua plug-in
> can change the measure width.
> Finally, I have created a short reproduceable demo that I can't explain.
>
> The script is below.
> When applied to the score of the attached Finale file, it switches to
> linked part 3, loads measure 1 and changes its measure width to 360 and
> then returns to the score.
> The measure width in the score remains unchanged. So far, everything ok.
> Then I undo the plug-in in Finale and click on Edit->Redo ...
> Now the width in measure 1 also changes in the score!
>
> Here is a video that shows the effect (with a slightly different version
> of the score):
> https://www.youtube.com/watch?v=lPJd3sq9zQg
>
> In Perfect Layout it makes Finale's Undo-/Redo feature unusuable, because
> it (nearly) always changes the measure widths in the score for an unknown
> reason.
> Do you have an idea how I can prevent this?
>
> Jan
>
> --Show measure 1 width from score
> local meas=finale.FCMeasure(1)
> meas:Load(1)
> print("Measure Width in Score",meas.Width)
>
> --Load Part 3 and change
> local p=finale.FCPart(3)
> p:SwitchTo();
>     p:ViewInDocument()
>     meas=finale.FCMeasure(1)
>     meas:Load(1)
>     print("Measure Width in Part ",p.ID,meas.Width)
>     meas.Width=360
>     meas:Save()
>     print("Measure Width after change",meas.Width)
> p:SwitchBack();
>
> --Go back to score and show measure 1 width
> p=finale.FCPart(0)
> p:ViewInDocument()
> meas=finale.FCMeasure(1)
> meas:Load(1)
> print("Measure Width in Score",meas.Width)
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