Refactor StatsPlots extension: Extract helper functions for container handling

[Copilot]

The StatsPlots extension had significant code repetition across plot functions for container management, attribute setup, and palette creation. This refactors common patterns into reusable helpers.

Helper Functions Added

• clear_container! - Clears plot container using empty!()
• setup_plot_attributes - Returns (gr_back, attributes, attributes_redux) based on backend
• create_extended_palette - Creates extended palette with alpha reduction
• group_container_by_model_and_merge_diffs - Groups by model name and merges diff dicts
• create_reduced_vector_and_diffdict - Creates reduced vector and computes diff dict

Functions Updated

• plot_model_estimates / plot_model_estimates!
• plot_irf / plot_irf!
• plot_solution / plot_solution!
• plot_conditional_forecast / plot_conditional_forecast!
• plot_conditional_variance_decomposition

Example

Before:

gr_back = StatsPlots.backend() == StatsPlots.Plots.GRBackend()
if !gr_back
    attrbts = merge(DEFAULT_PLOT_ATTRIBUTES, Dict(:framestyle => :box))
else
    attrbts = merge(DEFAULT_PLOT_ATTRIBUTES, Dict())
end
attributes = merge(attrbts, plot_attributes)
attributes_redux = copy(attributes)
delete!(attributes_redux, :framestyle)

After:

gr_back, attributes, attributes_redux = setup_plot_attributes(plot_attributes)

Net reduction of ~150 lines.

Original prompt

in the StatsPlot extension identify code that ahndles elements of the containers. write functions so that theinidiviual plot functions are not as long and repetitive

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Benchmark Results

	main	601a9cd...	main / 601a9cd...
FS2000/NSSS	13.3 ± 0.46 μs	15.2 ± 0.9 μs	0.878 ± 0.06
FS2000/covariance	0.116 ± 0.003 ms	0.12 ± 0.026 ms	0.968 ± 0.21
FS2000/irf	0.991 ± 0.046 ms	0.999 ± 0.026 ms	0.992 ± 0.053
FS2000/jacobian	0.764 ± 0.002 μs	0.762 ± 0.0031 μs	1 ± 0.0048
FS2000/lyapunov/bartels_stewart	0.102 ± 0.0021 ms	0.101 ± 0.0024 ms	1.01 ± 0.032
FS2000/lyapunov/bicgstab	0.0444 ± 0.0014 ms	0.0443 ± 0.0014 ms	1 ± 0.045
FS2000/lyapunov/doubling	0.0406 ± 0.015 ms	0.0515 ± 0.015 ms	0.789 ± 0.37
FS2000/lyapunov/gmres	26.4 ± 3.1 μs	26.6 ± 3.5 μs	0.993 ± 0.18
FS2000/qme/doubling	0.121 ± 0.0025 ms	0.123 ± 0.0029 ms	0.99 ± 0.031
FS2000/qme/schur	0.0683 ± 0.016 ms	0.0854 ± 0.013 ms	0.8 ± 0.23
NAWM_EAUS_2008/NSSS	2.73 ± 0.049 ms	7.07 ± 0.62 ms	0.386 ± 0.034
NAWM_EAUS_2008/covariance	25.3 ± 0.17 ms	29.3 ± 0.43 ms	0.863 ± 0.014
NAWM_EAUS_2008/irf	27 ± 0.41 ms	31.1 ± 1.1 ms	0.868 ± 0.033
NAWM_EAUS_2008/jacobian	0.0611 ± 0.0037 ms	0.062 ± 0.0041 ms	0.985 ± 0.088
NAWM_EAUS_2008/lyapunov/bartels_stewart	28.9 ± 0.65 ms	28.6 ± 1.5 ms	1.01 ± 0.059
NAWM_EAUS_2008/lyapunov/bicgstab	0.221 ± 0.0045 s	0.215 ± 0.0095 s	1.03 ± 0.05
NAWM_EAUS_2008/lyapunov/doubling	16.6 ± 0.58 ms	16.7 ± 0.78 ms	0.998 ± 0.058
NAWM_EAUS_2008/lyapunov/gmres	0.14 ± 0.0015 s	0.141 ± 0.0041 s	0.993 ± 0.031
NAWM_EAUS_2008/qme/doubling	23 ± 0.57 ms	23 ± 0.7 ms	0.999 ± 0.039
NAWM_EAUS_2008/qme/schur	16.5 ± 0.49 ms	15.7 ± 0.5 ms	1.05 ± 0.046
Smets_Wouters_2007/NSSS	0.16 ± 0.012 ms	0.16 ± 0.012 ms	1 ± 0.11
Smets_Wouters_2007/covariance	1.66 ± 0.04 ms	1.66 ± 0.04 ms	1 ± 0.034
Smets_Wouters_2007/irf	5.53 ± 0.21 ms	5.56 ± 0.25 ms	0.996 ± 0.058
Smets_Wouters_2007/jacobian	10.4 ± 22 μs	30.9 ± 2.1 μs	0.335 ± 0.72
Smets_Wouters_2007/lyapunov/bartels_stewart	1.52 ± 0.013 ms	1.51 ± 0.015 ms	1.01 ± 0.013
Smets_Wouters_2007/lyapunov/bicgstab	6.18 ± 0.05 ms	6.09 ± 0.16 ms	1.01 ± 0.029
Smets_Wouters_2007/lyapunov/doubling	0.965 ± 0.012 ms	0.965 ± 0.013 ms	1 ± 0.018
Smets_Wouters_2007/lyapunov/gmres	6.81 ± 0.45 ms	6.81 ± 0.47 ms	1 ± 0.096
Smets_Wouters_2007/qme/doubling	1.73 ± 0.015 ms	1.74 ± 0.021 ms	0.994 ± 0.015
Smets_Wouters_2007/qme/schur	1.41 ± 0.023 ms	1.43 ± 0.03 ms	0.985 ± 0.026
time_to_load	8.28 ± 0.018 s	8.26 ± 0.026 s	1 ± 0.0039

	main	601a9cd...	main / 601a9cd...
FS2000/NSSS	0.357 k allocs: 18.8 kB	0.357 k allocs: 18.8 kB	1
FS2000/covariance	1.06 k allocs: 0.13 MB	1.06 k allocs: 0.13 MB	1
FS2000/irf	6.98 k allocs: 0.335 MB	6.98 k allocs: 0.335 MB	1
FS2000/jacobian	1 allocs: 16 B	1 allocs: 16 B	1
FS2000/lyapunov/bartels_stewart	0.074 k allocs: 0.0656 MB	0.074 k allocs: 0.0656 MB	1
FS2000/lyapunov/bicgstab	0.087 k allocs: 0.0377 MB	0.087 k allocs: 0.0377 MB	1
FS2000/lyapunov/doubling	0.063 k allocs: 0.0393 MB	0.063 k allocs: 0.0393 MB	1
FS2000/lyapunov/gmres	0.145 k allocs: 0.0815 MB	0.145 k allocs: 0.0815 MB	1
FS2000/qme/doubling	0.2 k allocs: 0.0431 MB	0.2 k allocs: 0.0431 MB	1
FS2000/qme/schur	0.266 k allocs: 0.0842 MB	0.266 k allocs: 0.0842 MB	1
NAWM_EAUS_2008/NSSS	1.65 k allocs: 1.51 MB	2.66 k allocs: 5.07 MB	0.298
NAWM_EAUS_2008/covariance	4.23 k allocs: 15.5 MB	5.24 k allocs: 19 MB	0.813
NAWM_EAUS_2008/irf	0.101 M allocs: 16.3 MB	0.102 M allocs: 19.9 MB	0.821
NAWM_EAUS_2008/jacobian	7 allocs: 0.709 MB	7 allocs: 0.709 MB	1
NAWM_EAUS_2008/lyapunov/bartels_stewart	0.173 k allocs: 4.92 MB	0.181 k allocs: 4.92 MB	1
NAWM_EAUS_2008/lyapunov/bicgstab	0.09 k allocs: 5.66 MB	0.09 k allocs: 5.66 MB	1
NAWM_EAUS_2008/lyapunov/doubling	0.07 k allocs: 6.87 MB	0.07 k allocs: 6.87 MB	1
NAWM_EAUS_2008/lyapunov/gmres	0.393 k allocs: 0.0415 GB	0.393 k allocs: 0.0415 GB	1
NAWM_EAUS_2008/qme/doubling	0.309 k allocs: 6.29 MB	0.309 k allocs: 6.29 MB	1
NAWM_EAUS_2008/qme/schur	0.419 k allocs: 7.41 MB	0.419 k allocs: 7.41 MB	1
Smets_Wouters_2007/NSSS	1.26 k allocs: 0.0594 MB	1.26 k allocs: 0.0728 MB	0.816
Smets_Wouters_2007/covariance	3.07 k allocs: 1.34 MB	3.07 k allocs: 1.35 MB	0.99
Smets_Wouters_2007/irf	0.0332 M allocs: 2.2 MB	0.0332 M allocs: 2.21 MB	0.994
Smets_Wouters_2007/jacobian	7 allocs: 0.0612 MB	7 allocs: 0.0612 MB	1
Smets_Wouters_2007/lyapunov/bartels_stewart	0.084 k allocs: 0.441 MB	0.08 k allocs: 0.44 MB	1
Smets_Wouters_2007/lyapunov/bicgstab	0.089 k allocs: 0.469 MB	0.089 k allocs: 0.469 MB	1
Smets_Wouters_2007/lyapunov/doubling	0.069 k allocs: 0.568 MB	0.069 k allocs: 0.568 MB	1
Smets_Wouters_2007/lyapunov/gmres	0.301 k allocs: 2.65 MB	0.301 k allocs: 2.65 MB	1
Smets_Wouters_2007/qme/doubling	0.3 k allocs: 0.623 MB	0.3 k allocs: 0.623 MB	1
Smets_Wouters_2007/qme/schur	0.403 k allocs: 0.756 MB	0.403 k allocs: 0.756 MB	1
time_to_load	0.143 k allocs: 10.6 kB	0.143 k allocs: 10.6 kB	1

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.64%. Comparing base (f4a8b7e) to head (601a9cd).

Files with missing lines	Patch %	Lines
ext/StatsPlotsExt.jl	98.36%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f4a8b7e) and HEAD (601a9cd). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (f4a8b7e)	HEAD (601a9cd)
	21	5

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #198       +/-   ##
===========================================
- Coverage   87.46%   76.64%   -10.83%     
===========================================
  Files          20       20               
  Lines       12865    12652      -213     
===========================================
- Hits        11253     9697     -1556     
- Misses       1612     2955     +1343     

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