pmx_plot_npde_pred(strat.color=arg) not working

[souto1]

Describe the bug
pmx_plot_npde_pred(strat.color=arg) not working as expected

To Reproduce
The code below produced the same plots without stratification by colour.

ctr = pmx_mlxtran(mlxtran, dvid = "YTYPE")
ctr %>% pmx_plot_npde_pred()
ctr %>% pmx_plot_npde_pred(strat.color="TRT2")

Expected behavior
Plots with colours mapped by the strat.color argument.

Package and platform (please complete the following information):

• ggplot2 version 3.5.1
• ggPMX version 1.2.11

[A2P2]

Thank you for finding an issue. Confirmed. Only works for qq plots.
@souto1 As a work around you can do:

p <- ctr %>% pmx_plot_npde_pred(strat.color="TRT2")
p + geom_point(aes(color = TRT2)) + scale_color_discrete()

Note for us:
See the difference how strat.color is applied here:

https://github.com/ggPMXdevelopment/ggPMX/blob/bd679e25ffc50f22ae2773587a44bca50f24ede6/R/plot-qq.R

Doesn't work here, potentially due to this line setting to NULL (not sure):

https://github.com/ggPMXdevelopment/ggPMX/blob/bd679e25ffc50f22ae2773587a44bca50f24ede6/R/plot-residual.R#L119C9-L119C36