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fix: stabilize mermaid subgraph title width #159

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Merged
OlaProeis merged 1 commit into from
Jun 17, 2026
Merged

fix: stabilize mermaid subgraph title width #159

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17 changes: 13 additions & 4 deletions src/markdown/mermaid/flowchart/layout/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,15 @@ use config::FlowLayoutConfig;
use graph::FlowGraph;
use sugiyama::SugiyamaLayout;

fn stable_min_width_for_title(
title: &str,
font_size: f32,
text_measurer: &impl TextMeasurer,
) -> f32 {
let title_text_size = text_measurer.measure(title, font_size);
(title_text_size.width + 24.0).ceil()
}

/// Compute layout for a flowchart using a Sugiyama-style layered graph algorithm.
///
/// The `text_measurer` parameter enables accurate text sizing. Use `EguiTextMeasurer`
Expand Down Expand Up @@ -118,8 +127,8 @@ fn compute_subgraph_layouts(

// Ensure subgraph width accommodates the title text
if let Some(title) = &subgraph.title {
let title_text_size = text_measurer.measure(title, font_size);
let min_width_for_title = title_text_size.width + 24.0;
let min_width_for_title =
stable_min_width_for_title(title, font_size, text_measurer);
if existing.size.x < min_width_for_title {
existing.size.x = min_width_for_title;
}
Expand Down Expand Up @@ -183,8 +192,8 @@ fn compute_subgraph_layouts(

// Ensure subgraph width accommodates the title text
if let Some(title) = &subgraph.title {
let title_text_size = text_measurer.measure(title, font_size);
let min_width_for_title = title_text_size.width + 24.0;
let min_width_for_title =
stable_min_width_for_title(title, font_size, text_measurer);
let current_width = padded_max.x - padded_min.x;
if current_width < min_width_for_title {
padded_max.x = padded_min.x + min_width_for_title;
Expand Down
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