Improvements to Stack(Pivot Longer) dialog

[Vitalis95]

Partially solves #6868
@rdstern @shadrackkibet, this is for the Drop Missing Values Checkbox. Have a look at it.

[lloyddewit]

@N-thony Please could you do the first peer review? thanks

[rdstern]

I really like the fact this now has new features from the pivot_longer function.
But I assume that the old feature of being able to stack multiple sets is still to be re-instated? I would be happy for it to be done "in the old way" so it doesn't necessarily use pivot_longer. I suggest we only use the tidyverse functions when they are convenient. It isn't a rule.

[shadrackkibet]

I really like the fact this now has new features from the pivot_longer function. But I assume that the old feature of being able to stack multiple sets is still to be re-instated? I would be happy for it to be done "in the old way" so it doesn't necessarily use pivot_longer. I suggest we only use the tidyverse functions when they are convenient. It isn't a rule.

This feature is going to be reinstated on this PR. I did discuss it with @Vitalis95 so we will soon have it ready for testing.

[Vitalis95]

@shadrackkibet, have a look at it.

[lloyddewit]

@Vitalis95 Please could you resolve @N-thony 's comment above? thanks

[rdstern]

@Vitalis95 to me this looks fine now. Let's see what @shadrackkibet thinks?

[N-thony]

Push a bit Name to label to the left, so that it aligns properly with other controls on the left side. Same case with New Data Frame Name label

[Vitalis95]

@N-thony , I have made the alignments.

[rdstern]

Looks good now.

[lloyddewit]

@Vitalis95 Thanks, this looks good, just a few suggestions

[Vitalis95]

@lloyddewit I have made the changes. Thanks

[lloyddewit]

@Vitalis95 thanks, looks good

[lloyddewit]

@rdstern there's been some small changes since your last approval, please could you retest? thanks

[rdstern]

Great!