Add ability to debounce of the toolbar show in the WidgetToolbarRepository due to Google Chrome selection quirks.

[Mati365]

Suggested merge commit message (convention)

Fix (bookmark): Prevent bookmark popup flickering when clicking paragraphs with trailing bookmarks.

---

Additional information

When a widget (e.g., a bookmark anchor) is clicked, two consecutive update events may fire:

1. First, when the widget gets focused (this is fine)
2. Second, when the selection changes shortly after (beware, dragons live here)

While the widget usually stays selected, sometimes the selection may move to a different element (e.g., to the start of the parent paragraph). This can cause the toolbar to flicker as it's quickly shown and hidden.

This issue particularly affects widgets like anchors that contain a single SVG element. To prevent the flickering, we need to debounce the toolbar visibility updates.

Debounce is added as a flag because it does not apply to all HTML constructs, only selected ones.

Before

2024-12-23.10-11-39.mp4

After

after-fix-2024-12-23_16.41.38.mp4