Rémi Verschelde 05143ca39a Tooltips: Improve code clarity and docs ...

The return type for `_make_custom_tooltip` is clarified as Control, and users
should make sure to return a visible node for proper size calculations.

Moreover in the current master branch, a PopupPanel will be added as parent
to the provided tooltip to make it a sub-window.

Clarifies documentation for `Control._make_custom_tooltip`, and shows how to
use the (until now undocumented) "TooltipPanel" and "TooltipLabel" theme types
to style tooltips.

Fixes #39677.

(cherry picked from commit c5d8dafec4)

2020-11-11 15:30:56 +01:00

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