Hover event not triggered on consecutive empty bins (count=0) with `hovermode:'x'` for histogram

[Lexachoc]

Reproducible example

See the demo: https://codepen.io/Lexachoc/pen/MYaJGgo

The problem

When using hovermode:'x', the hoverinfo is displaying when hovering through all bins (including those count=0).

Note that the binNumber (extracted from the hover event) has remained at the first empty bin number!

Recording:

Why this is important to address

1. It breaks the expected behavior of hovermode:'x' over consecutive zero-count bins.
   I expected hover events to fire across the entire x-axis regardless of the bin value (y value).
2. plotly_hover reports stale binNumber value, unable to know the actual bin under the cursor when y=0 (count=0).

Note

I use hovermode:'x' because I want hover events to trigger even when the cursor is above the bin, not just directly over the bar area. The default hover behavior only fires when hovering on the bar itself.

Use case

You can see the hover highlight becomes disconnected because no hover event is fired over consecutive zero-count bins, causing the effect to break.

PixPin_2025-07-31_16-39-30.mp4

[Lexachoc]

After applying the PR #7503

The hover effect now works continuously.

PixPin_2025-07-31_19-01-45.mp4