Automatic tooltip for TextBlock's that get clipped

We should consider applying a tooltip where possible on TextBlock’s that are clipped either due to maxLines or wrap: false

Seen here a tooltip on the “Too long Agenda Event T…” would improve the user experience.

Doesn’t require schema changes, if we’re agreed on this desired behavior, open question is simply how feasible this is on all renderers.

[hulin17]

I think ToolTip has another function that it can be used to tell end-users an element can be clicked when users hover over the element. I noticed there is not a function like hovering over element to remind users to know what the element is used for. So if there are too many “Clicked elements”, tooltip or hovering function is necessary. Otherwise users maybe feel confused.

[dclaux]

It’s a good idea, but the problem is that the truncation is done by the layout engine (the browser for HTML), and as far as I know there is no other way to determine whether the truncation did happened than to:

• Render the TextBlock without applying truncation
• Render the TextBlock with truncation applied
• Get the resulting bounding boxes of both and compare them

This is a very expensive process that would significantly impact performance, especially on Edge where getBoundingClientRect is significantly slower than in other browsers.