fix(tooltip): add space between multiline labels in tooltip title #12186
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When chart labels are arrays (for multiline display on the axis), the tooltip title was joining them with comma only (e.g., 'Yellow,subTitle') instead of comma and space (e.g., 'Yellow, subTitle'). This fix joins array labels with ', ' for proper formatting in tooltips. Fixes chartjs#12049
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Summary
Fixes #12049
When using array labels for multiline display (e.g.,
['Yellow', 'subTitle']), the tooltip was joining them with just a comma ('Yellow,subTitle') instead of a comma and space ('Yellow, subTitle').Changes
createTooltipIteminplugin.tooltip.jsto join array labels with', 'instead of relying on default array-to-string conversionTesting
Added a test case verifying that multiline array labels are properly joined with comma and space in the tooltip title.