Highlight constructor name on invocation for inspector

[FMorschel]

We have some IDE things like Show Type Hierarchies that highlight a range (in this case, the type name - see dart-lang/sdk#62815 for a recent issue around it). I think it would be beneficial for the inspector if we could see the constructor invocation highlighted, too. Not just move the IDE focus to the line where it is, since that can be a bit ambiguous in case of nested similar structures.

CC @DanTup

[DanTup]

I took a quick look at this, and I'm not actually sure in VS Code we can highlight text in the same way that features like Show Call Hierarchy do. It applies some kind of highlight that is not a selection, and it persists while the item remains selected in that tree.

The best we could do is set the actual editor selection, which is not quite the same.

The first question though is whether the widget inspector has enough information to provide the range of the constructor name (and not just a single position). I tried to search for navigateToCode (assuming it's using this DTD method) in both DevTools and Flutter, but couldn't find it (I did find some Widget Preview code that forwards it though).

@elliette do you know where the code is that triggers the navigation event when selecting a node in the widget inspector (and/or do you know if it has the whole range of the constructor name, or only the position of the start?).

An alternative is for Dart-Code to just select the "word" at the location when it handles this API, but that would apply to all navigations and I don't know if it would always be appropriate - for example at 0:0 we probably don't want to select an import keyword.

[elliette]

@elliette do you know where the code is that triggers the navigation event when selecting a node in the widget inspector (and/or do you know if it has the whole range of the constructor name, or only the position of the start?).

That code actually lives in the Flutter framework: https://github.com/flutter/flutter/blob/662fc4aa42b3b390de4d871aa7e1535261f94946/packages/flutter/lib/src/widgets/widget_inspector.dart#L1644-L1649

It doesn't include a range, only the start position