[SF][Safari][ui5-panel]: header focus style is not right in Safari for horizon theme

[GongRichard]

Bug Description

The header focus style of ui5-panel is not right in Safari for horizon theme.

Expected Behavior

Should have border-radius for header focus style

Steps to Reproduce

1. Use Safari to go to 'https://sap.github.io/ui5-webcomponents/playground/components/Panel/?sap-ui-theme=sap_horizon&isrtl=false'
2. The header focus style of ui5-panel is not right in Safari for horizon theme.

Context

• UI5 Web Components version: {1.4.0}
• OS/Platform: {...}
• Browser: {Safari}
• Affected component: {...}

Log Output / Stack Trace / Screenshots

Priority

• [ ] Low
• [x] Medium
• [ ] High
• [ ] Very High

The priority indicates the severity of the issue. To set the appropriate priority consider the following criteria:

• Breaks entire application or system - High or Very High
• Accessibility issue - Medium or High
• Functional issue - Medium or High
• Visual issue - Low or Medium

Note: The priority might be re-evaluated by the issue processor.

Stakeholder Info (if applicable)

• Organization: {SAP SuccessFactors}
• Business impact: {...}

[stbodurov]

Hi @SAP/ui5-webcomponents-topic-rl,

Looks like the focus border radius of ui5-panel's header is improperly visualized on Safari. This is reproducible in the samples: https://sap.github.io/ui5-webcomponents/playground/components/Panel/?sap-ui-theme=sap_horizon&isrtl=false

Could you take a look?

Regards, Stanislav