Redundant \cmidrule commands in formal tables

[Andrew Parsloe]

On 18/09/2020 11:33 pm, Jürgen Spitzmüller wrote:
> Am Freitag, den 18.09.2020, 22:50 +1200 schrieb Andrew Parsloe:
>> I've attached a mwe. I created a 2 row, 3 column table, changed to
>> Formal Style, cleared the internal rules (leaving top and bottom
>> rules), then joined the 2nd and 3rd cells of the top row using the
>> button on the table toolbar. Now clicking the lower border button
>> with the cursor in the combined cell produces the duplicate \cmidrule
>> commands (as viewed in the Code Preview Pane).
> Thanks. I see it in 2.3.x, but not in 2.4.x, where the table is
> exported as
>
> \begin{tabular}{ccc}
> \toprule
>   & \multicolumn{2}{c}{}\tabularnewline
> \cmidrule{2-3}
>   &  & \tabularnewline
> \bottomrule
> \end{tabular}
>
> As this is a mere cosmetic issue and since 2.4.x has a completely
> reworked and extended cmidrule handling which cannot be backported, I
> propose we leave things as they are.
>
> Jürgen
Yes, it didn't break compilation to pdf. I was using LyX (as I often do) 
to see what the underlying LaTeX looked like in the Code Preview Pane.
Andrew