Fix broken SVGs by not using Cairo.pattern_set_extend(p, Cairo.EXTEND_PAD)

[jkrumbiegel]

Fixes #3016 for me on Firefox and Chrome and makes such SVGs editable in Inkscape. Firefox would not show SVGs with a continuous colorbar at all before and Chrome would glitch. The command Cairo.pattern_set_extend(p, Cairo.EXTEND_PAD) was present only because otherwise you'd get blurry edges when rendering pngs. Removing it for SVG surfaces does not seem to introduce any adverse effects. The effect of the pattern extend must have changed with some of the more recent Cairo updates.

[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(fig)

	using	create	display	create	display
GLMakie	4.32s (4.29, 4.37) 0.02+-	105.78ms (103.69, 108.29) 1.81+-	488.18ms (479.45, 495.49) 5.02+-	8.57ms (8.35, 8.77) 0.16+-	25.76ms (25.53, 26.18) 0.21+-
master	4.32s (4.26, 4.39) 0.04+-	106.44ms (104.17, 109.75) 1.75+-	491.94ms (480.54, 505.31) 8.75+-	8.64ms (8.49, 8.82) 0.11+-	25.79ms (25.53, 26.19) 0.20+-
evaluation	1.00x invariant, 0.0s (0.00d, 0.99p, 0.03std)	1.01x invariant, -0.66ms (-0.37d, 0.50p, 1.78std)	1.01x invariant, -3.76ms (-0.53d, 0.35p, 6.88std)	1.01x invariant, -0.06ms (-0.44d, 0.43p, 0.14std)	1.00x invariant, -0.03ms (-0.14d, 0.79p, 0.21std)
CairoMakie	3.96s (3.84, 4.08) 0.08+-	109.91ms (103.81, 122.19) 6.68+-	133.21ms (127.65, 148.48) 7.52+-	8.38ms (8.15, 8.68) 0.20+-	986.74μs (971.85, 997.90) 9.10+-
master	3.72s (3.61, 3.85) 0.09+-	112.26ms (105.93, 123.56) 6.68+-	136.36ms (129.28, 146.82) 5.53+-	8.39ms (8.04, 9.07) 0.35+-	987.66μs (977.02, 1010.90) 11.34+-
evaluation	0.94x slower❌, 0.24s (2.70d, 0.00p, 0.09std)	1.02x invariant, -2.35ms (-0.35d, 0.52p, 6.68std)	1.02x invariant, -3.15ms (-0.48d, 0.39p, 6.53std)	1.00x invariant, -0.0ms (-0.01d, 0.98p, 0.27std)	1.00x invariant, -0.92μs (-0.09d, 0.87p, 10.22std)
WGLMakie	4.52s (4.38, 4.82) 0.18+-	108.85ms (103.86, 114.33) 4.29+-	9.31s (8.71, 10.02) 0.58+-	9.96ms (9.23, 10.49) 0.41+-	70.89ms (69.34, 72.52) 1.14+-
master	4.64s (4.41, 4.82) 0.17+-	112.35ms (102.75, 122.16) 6.89+-	9.40s (8.90, 10.10) 0.47+-	11.11ms (10.27, 14.94) 1.69+-	71.81ms (70.87, 73.83) 1.09+-
evaluation	1.03x invariant, -0.13s (-0.72d, 0.20p, 0.18std)	1.03x invariant, -3.49ms (-0.61d, 0.28p, 5.59std)	1.01x invariant, -0.09s (-0.18d, 0.75p, 0.52std)	1.12x noisy🤷‍♀️, -1.15ms (-0.94d, 0.13p, 1.05std)	1.01x invariant, -0.92ms (-0.83d, 0.15p, 1.11std)