Fix alt+arrow navigation for dynamics

[mike-spa]

Resolves: #26249 (part of)
Did my best

[MarcSabatella]

This seems to work well from my perspective, thanks!

One thing I just realized, though - not new to the PR, but I don't actually see a way to put the dynamic into Edit mode via keyboard, should I wish to change the text. I can tab into it to change the dynamic that way, but F2 toggles ther popup rather than placing the dynamic into Edit mode. I can get there via the context menu, and Ctrl+D puts me in edit mode right away, so this is hardly a showstopper. But F2 did work to enable edit mode in previous releases.

I suppose it's possible there is a reason for F2 toggling the pop-up, but if not, I wonder if a similar "one line fix" would bypass that and allow it to engage edit mode like it does for other text?

[avvvvve]

@MarcSabatella Good catch! Logged that separately here: #26850

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@mike-spa this looks good to me! approved