Repository: ionic-team/ionic-framework
File: core/src/components/toolbar/toolbar.tsx (TypeScript)

Code before:

    const tagName = (ev.target as HTMLElement).tagName;
    const updatedStyles = ev.detail;
    const newStyles = {} as CssClassMap;
    const childStyles = this.childrenStyles.get(tagName) || {};

    let hasStyleChange = false;
    Object.keys(updatedStyles).forEach((key) => {
      const childKey = `toolbar-${key}`;
      const newValue = updatedStyles[key];
      if (newValue !== childStyles[childKey]) {
        hasStyleChange = true;
      }
      if (newValue) {
        newStyles[childKey] = true;
      }
    });

    if (hasStyleChange) {
      this.childrenStyles.set(tagName, newStyles);
      forceUpdate(this);
    }
  }

  render() {
    const theme = getIonTheme(this.el);
    const childStyles = {};
    this.childrenStyles.forEach((style) => {
      Object.assign(childStyles, style);
    });

    return (
      <Host
        class={{
          ...createColorClasses(this.color, {
            [theme]: true,
            'in-toolbar': hostContext('ion-toolbar', this.el),
          }),
          ...childStyles,
        }}
      >
        <div class="toolbar-background" part="background"></div>
        <div class="toolbar-container" part="container">
          <slot name="start"></slot>
          <slot name="secondary"></slot>
          <div class="toolbar-content" part="content">
            <slot></slot>
          </div>
          <slot name="primary"></slot>
          <slot name="end"></slot>
        </div>

Review comment (suggestion):
```suggestion
    const theme = getIonTheme(this);
```

Is this change necessary? I see the same theme logged checking `this`.

Code after:
    // Then set the CSS custom properties based on the largest width in each pair
    slotPairs.forEach(({ name, slots }) => {
      // Find the maximum width among the slots in this pair
      let maxWidth = 0;
      let hasAnyContent = false;

      slots.forEach((slot) => {
        if (slotWidths.has(slot)) {
          hasAnyContent = true;
          maxWidth = Math.max(maxWidth, slotWidths.get(slot) ?? 0);
        }
      });

      // If at least one slot in the pair has content, set the min-width for the pair
      if (hasAnyContent && maxWidth > 0) {
        // Set a single CSS variable for the pair
        this.el.style.setProperty(`--${name}-size`, `${maxWidth}px`);
      }
    });

    return allMeasurementsSuccessful;
  }

  private updateSlotClasses() {
    // Check if slots have content
    const slots = ['start', 'end', 'primary', 'secondary'];

    const classesToAdd: string[] = [];
    const classesToRemove: string[] = [];
    slots.forEach((slot) => {
      const slotHasContent = this.hasSlotContent(slot);
      const slotClass = `has-${slot}-content`;
      if (slotHasContent) {
        classesToAdd.push(slotClass);
      } else {
        classesToRemove.push(slotClass);
      }
    });

    // Force visibilities in certain conditions. This works by adding a class to the toolbar
    // named `show-{slot}`. This class will be added if the toolbar has the required slots
    // and does not have any of the excluded slots, otherwise it will be removed.
    // This is useful to enforce centering of the toolbar content when there are different amounts
    // of slots on either side of the toolbar.
    const conditions = [
      { name: 'end', requiredSlots: ['start'], excludeSlots: ['end', 'primary'] },
      { name: 'start', requiredSlots: ['end'], excludeSlots: ['start', 'secondary'] },
      { name: 'secondary', requiredSlots: ['primary'], excludeSlots: ['secondary', 'start'] },
      { name: 'primary', requiredSlots: ['secondary'], excludeSlots: ['primary', 'end'] },
    ];
    conditions.forEach((condition) => {