Description

Fixes #12080

Currently, moving the cursor from a data point into the tooltip causes the tooltip to disappear immediately, because the tooltip area is not part of the chart's interaction region. This is especially problematic on scatter plots where the data point is small and the user wants to read the tooltip content.

Solution

Added a new tooltip.persistOnHover option (default: false). When enabled, if the cursor leaves a data point but enters the tooltip's bounding box, the tooltip stays visible. It hides normally once the cursor leaves the tooltip area entirely.

Changes

• src/plugins/plugin.tooltip.js — added _isMouseOverTooltip() helper and a guard in _getActiveElements() that returns the previous active elements when the cursor is over the tooltip bounding box
• src/types/index.d.ts — added persistOnHover: boolean to TooltipOptions

Usage

options: {
  plugins: {
    tooltip: {
      persistOnHover: true
    }
  }
}