Mermaid diagram size in pptx

Start with the provided test.qmd and render it using quarto render test.qmd with the pptx format and mermaid-format: png. Compare outputs after changing fig-width and fig-height; done means those values visibly change the Mermaid diagram size in the generated presentation.

Bug description

I've had to update to the latest release of Quarto to get Mermaid diagrams rendering within pptx. However, it seems like the sizing feature doesn't work.

Steps to reproduce

• Install Quarto 1.5.57. I did this via nix. Install chromium if needed quarto install chromium.
• Put the following in test.qmd and run quarto render test.qmd.
• Change values of fig-height or fig-width. The mermaid diagram doesn't change size.

---
title: "Talk title"
author: "Person"
format:
  pptx:
    mermaid-format: png
---


# Introduction
## Model outline
- Schematic of model
```{mermaid}
%%| fig-width: 2.5
%%| fig-height: 2
graph LR
    subgraph Demand
    P[Population] --> A[Activities]
    A --> Pl[Plans]
    end
    subgraph Supply
    OSM --> mm[Multi-modal network]
    GTFS --> mm
    
    end
    Pl --> S[Simulation]
    mm --> S
```

Expected behavior

No response

Actual behavior

No response

Your environment

• IDE: VS Code
• MacOS 14.6.1 (23G93)

Quarto check output

Quarto 1.5.57
[✓] Checking versions of quarto binary dependencies...
Pandoc version 3.1.11: OK
Dart Sass version 1.77.6: OK
Deno version 1.45.5: OK
Typst version 0.11.1: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
Version: 1.5.57
Path: /nix/store/fbxjhdksjyv1diy3b7c4v0105mq8kj78-quarto-1.5.57/bin

[✓] Checking tools....................OK
TinyTeX: v2022.10
Chromium: 869685

[✓] Checking LaTeX....................OK
Using: TinyTex
Path: /Users/ravis/Library/TinyTeX/bin/universal-darwin
Version: 2022

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
Version: 3.12.4
Path: /nix/store/72kk8px8v1c30plk6swp07gmalfx6b00-python3-3.12.4-env/bin/python3.12
Jupyter: 5.7.2
Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
Version: 4.4.1
Path: /nix/store/jd2sha5rwj3xdgjiybyn464fqvya49lx-R-4.4.1/lib/R
LibPaths:
- /nix/store/s55j7kslsh2rid3nczspdxz6j06mqq8r-r-boot-1.3-30/library
- /nix/store/mvg1a863bnvz4p16wc9c29qvwa3xjfdn-r-class-7.3-22/library
- /nix/store/wrz50h27f39lycna0297hpbynvnr001a-r-MASS-7.3-61/library
- /nix/store/b3dk4wp7fp2riapfm4ksvb9d27j1kr2y-r-cluster-2.1.6/library
- /nix/store/ycy08ybvq2qzx8dwvd1ij52qnvxld61a-r-codetools-0.2-20/library
- /nix/store/yd744jjgv5yrbfmn3y1n67hp965l17v3-r-foreign-0.8-86/library
- /nix/store/0w98p50p5g34shspb2iq7fygwy0ng6hq-r-KernSmooth-2.23-24/library
- /nix/store/3czhdqrqmc9a972g8ddh6wpcazbk6kz8-r-lattice-0.22-6/library
- /nix/store/vyn4h516s1yhi3j7ildj89b9vhlnrkdw-r-Matrix-1.7-0/library
- /nix/store/05r2ymwxkh2l6khia0d7q7qimnlxxqic-r-mgcv-1.9-1/library
- /nix/store/ynid12lfaml2h8bp78ril9znazd0j0wc-r-nlme-3.1-165/library
- /nix/store/ngqnnhqaxzs5mhfn2y2179yr9ildp8fi-r-nnet-7.3-19/library
- /nix/store/jznn702s6lkinchbkpb7ppvn3xka4r8l-r-rpart-4.1.23/library
- /nix/store/0rhl8gg11yw4nm8jsxy1f2npbq3m7swj-r-spatial-7.3-17/library
- /nix/store/a0v0520g1xq07rvvx9wxixpil6v4blr9-r-survival-3.7-0/library
- /nix/store/v64x9qq78lq9lidcjn30vjp802v2a21x-r-rmarkdown-2.27/library
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- /nix/store/g92w52zrmkxlpa1yvr0jyg7y5xb4sh78-r-base64enc-0.1-3/library
- /nix/store/17k5win0f0k3fdi7kbanhlxksafbc8ka-r-cachem-1.1.0/library
- /nix/store/h9afrsdd90v530xhzj6vlxb7flr7cipy-r-fastmap-1.2.0/library
- /nix/store/68gm4b4kickkkizl5jvq8bqkn02lzd1a-r-rlang-1.1.4/library
- /nix/store/1iqjcwqm5q8mva12jv7hvpgdjyjadr04-r-htmltools-0.5.8.1/library
- /nix/store/qvwfak2fka2nfm03jhsyb7qfwnikzja5-r-digest-0.6.35/library
- /nix/store/yd99kfx7f1ksddrvjycbdvg83zkrkhw1-r-jquerylib-0.1.4/library
- /nix/store/z2h1g0f9b313giqilhhcal2xva366cip-r-jsonlite-1.8.8/library
- /nix/store/40kajq3zq6r78cm6khmxbw6cm4zs5max-r-lifecycle-1.0.4/library
- /nix/store/hjmz1zbbqdwn7fjsy3y8kjwhiyk283b6-r-cli-3.6.2/library
- /nix/store/nlbpf5b7aacgnzvkdzl13xa374kyg34j-r-glue-1.7.0/library
- /nix/store/i1p86d1b09p7n010rq8cdghpl9in0dcs-r-memoise-2.0.1/library
- /nix/store/24zvm4a0mlwcnj8ik0kpx4id33ayw1qv-r-mime-0.12/library
- /nix/store/g4y72xpnx863xzdir94lfvryv8k51yxh-r-sass-0.4.9/library
- /nix/store/vifb3s4vh89bk79qazcdn13s7m2c5v90-r-fs-1.6.4/library
- /nix/store/1gnpa4lhx8mc1vggy0jwqrp15zkic6s0-r-R6-2.5.1/library
- /nix/store/vwpp8399nhbihgzpqgck61fgcyf08zfd-r-rappdirs-0.3.3/library
- /nix/store/xzmrwfxibq99fay3p8wnqgzsmbr35zv0-r-evaluate-0.24.0/library
- /nix/store/sxqp72ivfa15cnrnf323zydnw3yfj880-r-fontawesome-0.5.2/library
- /nix/store/m07rxbx1235ic226c5ck8a6bj7xslkk9-r-knitr-1.47/library
- /nix/store/j7p2lfdravzid6azxx7wjbkm1l63id6n-r-highr-0.11/library
- /nix/store/vjrgbm0kd7brkwlxpnda64xw9ash85ja-r-xfun-0.45/library
- /nix/store/65rkzd27wwv3j15cc0rf518sycv4p1w7-r-yaml-2.3.8/library
- /nix/store/j5zlypfl64mwznhyd4swj961rqxmzwm0-r-tinytex-0.51/library
- /nix/store/psbsgbirc1kprsrp6n4qljg396xpq63h-apple-framework-CoreFoundation-11.0.0/Library
- /nix/store/jd2sha5rwj3xdgjiybyn464fqvya49lx-R-4.4.1/lib/R/library
knitr: 1.47
rmarkdown: 2.27

[✓] Checking Knitr engine render......OK