fix #2369

[SimonDanisch]

The (unnecessary) convert wrongfully took away the observable powers from color...

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(display(fig))

	using	create	display	create	display
GLMakie	29.79s (29.69, 29.91) 0.09+-	18.69s (18.62, 18.78) 0.06+-	16.75s (16.65, 16.94) 0.10+-	16.72ms (16.46, 16.96) 0.17+-	49.11ms (48.29, 51.20) 1.00+-
master	29.84s (29.65, 30.20) 0.21+-	18.76s (18.64, 18.88) 0.08+-	16.71s (16.69, 16.75) 0.02+-	16.70ms (16.49, 16.86) 0.13+-	48.95ms (48.17, 50.42) 0.75+-
evaluation	-0.18%, -0.05s invariant (-0.33d, 0.56p, 0.15std)	-0.35%, -0.06s invariant (-0.97d, 0.10p, 0.07std)	+0.21%, 0.03s invariant (0.50d, 0.39p, 0.06std)	+0.15%, 0.03ms invariant (0.17d, 0.76p, 0.15std)	+0.32%, 0.16ms invariant (0.18d, 0.74p, 0.88std)
CairoMakie	27.85s (27.64, 27.99) 0.14+-	18.80s (18.71, 18.92) 0.07+-	2.73s (2.66, 2.86) 0.06+-	18.36ms (18.08, 18.63) 0.18+-	22.96ms (22.82, 23.06) 0.09+-
master	28.00s (27.83, 28.14) 0.12+-	18.85s (18.71, 18.90) 0.06+-	2.69s (2.66, 2.73) 0.03+-	18.37ms (18.08, 18.90) 0.26+-	23.04ms (22.96, 23.10) 0.05+-
evaluation	-0.52%, -0.14s invariant (-1.10d, 0.06p, 0.13std)	-0.31%, -0.06s invariant (-0.90d, 0.12p, 0.06std)	+1.37%, 0.04s invariant (0.79d, 0.18p, 0.04std)	-0.03%, -0.01ms invariant (-0.02d, 0.96p, 0.22std)	-0.36%, -0.08ms invariant (-1.19d, 0.05p, 0.07std)
WGLMakie	33.62s (33.29, 33.74) 0.15+-	28.95s (28.64, 29.18) 0.19+-	43.04s (42.60, 43.90) 0.43+-	23.92ms (23.36, 25.05) 0.55+-	118.17ms (114.09, 132.32) 6.66+-
master	33.80s (33.68, 34.04) 0.12+-	29.01s (28.48, 29.14) 0.23+-	43.80s (43.28, 45.40) 0.74+-	23.05ms (22.50, 23.87) 0.47+-	80.42ms (72.70, 88.35) 5.38+-
evaluation	-0.54%, -0.18s faster ✓ (-1.30d, 0.03p, 0.14std)	-0.23%, -0.07s invariant (-0.31d, 0.58p, 0.21std)	-1.74%, -0.75s faster ✓ (-1.24d, 0.04p, 0.59std)	+3.63%, 0.87ms slower X (1.70d, 0.01p, 0.51std)	+31.94%, 37.75ms slower❌ (6.24d, 0.00p, 6.02std)