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Upgrade guide for Gantt v7.3.0

ResourceHistogram and ResourceUtilization DOM structure changed

The DOM structure of ResourceHistogram and ResourceUtilization (subclasses of TimelineHistogram) has changed. Histogram bars are now rendered in a shared SVG canvas (<svg>) overlaying the time axis, instead of individual SVGs inside each row cell. Custom CSS selectors targeting histogram bars may need updating.

Old structure (per-row SVG):

<div>
    <div>
        <svg>
            <rect ... />
        </svg>
    </div>
</div>

New structure (shared canvas):

<svg>
    <g data-record-id="...">
        <rect ... />
    </g>
</svg>

If you have custom CSS or JavaScript targeting .b-histogram svg rect or similar selectors, update them to target .b-histogram-canvas g rect instead.

Removed content: var(--fa) convenience rule from .b-icon / .b-fw-icon

The CSS convenience rule content: var(--fa) has been removed from the .b-icon::before and .b-fw-icon::before selectors. This rule previously allowed using Font Awesome icon classes like fa-book without also specifying the fa base class, but it interfered with using custom icon fonts alongside Bryntum products.

If you use Font Awesome icons with b-icon or b-fw-icon classes, you now need to include the fa base class.

Old code

// Button icon (still works - Button auto-adds `fa` class)
new Button({ icon : 'fa-book' });

// Direct HTML (BROKEN - needs `fa` class)
'<i class="fa-book"></i>'

// DomClassList (BROKEN - needs `fa` class)
domConfig.className['fa-book'] = 1;

New code

// Button icon (still works, but recommended to include `fa`)
new Button({ icon : 'fa fa-book' });

// Direct HTML (fixed)
'<i class="fa-book"></i>'

// DomClassList (fixed)
domConfig.className['fa'] = domConfig.className['fa-book'] = 1;
The `Button` and `MenuItem` widgets automatically add the `fa` base class when the icon starts with `fa-`, so existing code using these widgets will continue to work. However, we recommend updating to include `fa` explicitly for clarity and consistency.
If you set `iconCls` on event, resource, or timeRange records (e.g., `iconCls: 'fa-cog'`), you must now include the `fa` base class: `iconCls: 'fa fa-cog'`. Calendar, Scheduler, and other products that render these icons with the `b-icon` class will no longer display them correctly without the `fa` base class.

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