[FIX] web_tour: do not reposition hidden tips
[FIX] web_tour: do not reposition hidden tips

The tour system is made such that we always have at most one tip
displayed on every screen. Since commit [1], "inactive tips" (i.e.
tips that aren't displayed because there's already an higher
priority tip displayed), are rendered, but turned invisible (s.t.
their action is still consumed when their anchor is clicked on),
whereas before [1], those inactive tips weren't rendered.

As a consequence, in the enterprise Home Menu with **a lot** of
apps installed (e.g. on runbot), it lags when the user scrolls,
because all those invisible tips still do a lot of computation to
reposition themselves.

This commit skips these positionning computation for invisible
tips.

[1] 3bf1d8418f41bcaa0ba4b153620def11aaea0a2b

Issue spotted while testing task 2263600

closes odoo/odoo#54911

Signed-off-by: Quentin Smetz (qsm) <75b324bb495ac8d4f83496f7c52eda774af7ed7a@odoo.com>

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