[BUG] [GR] `marker_z` colours markers without considering `colorbar_scale`

[LRBaalmann]

Details

Changing the scaling of a colour bar with, e.g., colorbar_scale=:log10 only changes the scale of the colour bar but not the scale by which the markers are coloured. Therefore, the colours of the markers are misattributed in the colour bar (i.e. the colour bar is widely incorrect).

See the attached example images generated by the following code:

x = rand(10)
scatter(x, marker_z=1:10, ms=10)
scatter(x, marker_z=1:10, ms=10, colorbar_scale=:log10)

The markers are identically coloured in both plots even though the colour bars are scaled differently.

(Tested with GR and PlotlyJS. For the latter, colorbar_scale has no effect at all.)

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pythonplot			x
plotlyjs
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: v1.38.16 Backend version (]st -m <backend(s)>): GR v0.72.7 Output of versioninfo(): Julia Version 1.9.2 Commit e4ee485e909 (2023-07-05 09:39 UTC) Platform Info: OS: Linux (x86_64-linux-gnu) CPU: 8 × 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz WORD_SIZE: 64 LIBM: libopenlibm LLVM: libLLVM-14.0.6 (ORCJIT, tigerlake) Threads: 8 on 8 virtual cores Environment: LD_LIBRARY_PATH = /home/lrb/intel/oneapi/mpi/2021.5.1//libfabric/lib:/home/lrb/intel/oneapi/mpi/2021.5.1//lib/release:/home/lrb/intel/oneapi/mpi/2021.5.1//lib:/home/lrb/intel/oneapi/debugger/2021.5.0/gdb/intel64/lib:/home/lrb/intel/oneapi/debugger/2021.5.0/libipt/intel64/lib:/home/lrb/intel/oneapi/debugger/2021.5.0/dep/lib:/home/lrb/intel/oneapi/compiler/2022.0.2/linux/lib:/home/lrb/intel/oneapi/compiler/2022.0.2/linux/lib/x64:/home/lrb/intel/oneapi/compiler/2022.0.2/linux/compiler/lib/intel64_lin::/home/lrb/Codes/cdf/cdfjava/lib:/home/lrb/Codes/cdf/lib JULIA_EDITOR = code JULIA_NUM_THREADS = 8

[maltee1]

I can confirm that this bug affects the pgfplotsx backend as well