ToolTip issues prior to .NET 6.0

[SamBent]

This issue contains references to a number of ToolTip issues. It is intended as a convenience for search, and a collection point for common information. Please limit discussion to topics common to the collection as a whole; comments about the individual bugs should go into the appropriate linked issue.

The issues collected here are

• Issues present in .NET 4.8 and above (i.e. .NET Core 3.x, .NET 5.x, previews of .NET 6.0)
• Actual bugs, as opposed to design changes
• Contrary to, or blocking of, the new ToolTip behavior mandated by the WCAG 2.1 compliance work. See the spec
• Fixed by that work (in .NET 6.0)
• Not planned to be fixed in any earlier versions

Here is a sample app that illustrates most of the issues (see individual bugs for repro steps):
WpfApp3.zip
The app artificially sets all tooltips to delay for 5 seconds before opening, and to close after displaying for 15 seconds. This makes it easier to see the behavior, but does require a little patience.

[SamBent]

Here are the issues (not all of which appear in the mentions you probably see above):

• ToolTip shows when owner acquires focus via non-keyboard ToolTip shows when owner acquires focus via non-keyboard #4613. Moving between apps, minimizing/restoring an app, and other non-keyboard ways of changing focus, should not show the tooltip.
• Moving focus to an element with no ToolTip opens an ancestor's ToolTip Moving focus to an element with no ToolTip opens an ancestor's ToolTip #4614. Moving focus should not open a different element's tooltip.
• Ctrl+Shift+F10 waits before opening the ToolTip Ctrl+Shift+F10 waits before opening the ToolTip #4615. Ctrl+Shift+F10 should toggle the tooltip immediately.
• Mouse motion closes a ToolTip shown by keyboard Mouse motion closes a ToolTip shown by keyboard #4616. Unrelated mouse motion should not close the tooltip.
• Moving keyboard focus while a ToolTip is open shows the new ToolTip only after a delay Moving keyboard focus while a ToolTip is open shows the new ToolTip only after a delay #4617. Keyboard should work the same as mouse - a new tooltip shows immediately if another tooltip was already showing.
• ToolTip toggles on Ctrl+Shift+Alt+F10 ToolTip toggles on Ctrl+Shift+Alt+F10 #4618. Extra modifier keys shouldn't toggle the tooltip.
• BetweenShowDelay=0 does not work BetweenShowDelay=0 does not work #4619. Setting BetweenShowDelay to 0 should force the next tooltip to delay before opening.
• Tooltips show on keyboard focus Tooltips show on keyboard focus #4172. In 4.8 et al., controls built-in to WPF could opt out of the "keyboard focus shows tooltip" feature, but apps and 3rd-party controls could not. There should be a public, extensible, flexible way to do this.
• Closing a tooltip opened from keyboard does not raise ToolTipClosing event Closing a tooltip opened from keyboard does not raise ToolTipClosing event #4672. The The ToolTipClosing event should be raised whenever a tooltip closes, regardless of how it opened.
• Keyboard navigation to a Hyperlink doesn't show the tooltip Keyboard navigation to a Hyperlink doesn't show the tooltip #4673. Keyboard navigation to a ContentElement (e.g. Hyperlink) should show its tooltip.

[SamBent]

All these issues are fixed by the tooltip work in 6.0-preview7.

[taquion87]

I think #5730 should be included in this issues collection

[amirburbea]

I made a repro of this bug: https://github.com/amirburbea/PopupRepro

Run this app under .NET 5 and .NET 6 and you'll see that ListBoxItem has no issues with tooltip, but ComboBoxItem does.