show immediately when replacing current tooltip #6058
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Fixes #5703
Description
Moving the mouse from a control A that is showing a tooltip, to another control B that has a tooltip, should show B's tooltip immediately (ignoring its InitialShowDelay). This works correctly if A's tooltip is closed before checking whether B has a tooltip, which was always the case prior to .NET 6.0. The new tooltip behavior in 6.0 can keep A's tooltip open longer, and now needs to check whether a tooltip is already open when it decides that B wants to open its tooltip.
There's an ambiguous case when moving the mouse toward A's tooltip and passing over B. If the user intends to move to A's tooltip (e.g. to read the tooltip with Magnifier), the tooltip should stay open; but if the user intends to move to B, the tooltip should close and be immediately replaced by B's tooltip. We can't know the user's intent. Instead we delay replacing the tooltip long enough to detect steady motion toward A's tooltip, but short enough to open B's tooltip "immediately" if the user stops moving the mouse.
Customer Impact
Fixes a regression.
Regression
Yes
Testing
Risk
Low. Handles a case that couldn't happen in .NET 5.