(see attached video)

When changing a Label's text value continuously, the Label's Tooltip only displays the text when it was first elided. The tooltip is not updated afterwards if the text value is changed.

Repro steps:
1. Create a Label and a TextField
2. Register a callback that changes the value of the Label to match the value of the TextField
3. Type a long enough text to cause the Label's elision
4. Erase the text so the elision is not needed anymore

Expected result:
The tooltip is not displayed anymore.

Actual result:
The tooltip still displays a value.