Nearly every headless UI test opened with the same four-line prologue
(resolve the shared MainWindow, show it, cast its DataContext, wait for the
assembly list), then repeated the corelib lookup, the EnsureLazyChildren +
Children.OfType<T>().Single() drill, the registry single-by-header lookups,
and the open-an-assembly-and-wait dance. The duplication made the intent of
each test hard to see and every signature tweak a suite-wide edit.
Collapse those into TestHarness (BootAsync, OpenAssemblyAsync, GetCommand,
GetEntry) and TreeNavigation extensions (FindCoreLib, GetChild<T>, Expand<T>),
then apply them across the suite. Net ~865 lines of boilerplate removed with
no change in behaviour; the full headless suite stays green.
Extends the double-click-to-decompile path with a new-tab variant. RaiseRowActivated
now carries an OpenInNewTab flag; DockWorkspace branches on it to either reuse the
active tab (existing tree-selection path) or spawn a fresh DecompilerTabPageModel.
The view's OnGridDoubleTapped reads KeyModifiers.Shift; a new
DecompileMetadataRowInNewTabCommand exports the same gesture as a context-menu entry.
Assisted-by: Claude:claude-opus-4-7:Claude Code
DataGrid.DoubleTapped raises a RowActivated event on the metadata
page model. The dock workspace subscribes during AttachCustomContent
and resolves the row's metadataFile + Token to an IEntity via the
type system, then selects the matching tree node — which triggers
ShowSelectedNode → CreateTab → decompiler view, the same path a
click in the assembly tree takes. Falls through silently for rows
whose token doesn't resolve to an IEntity (heap rows, AssemblyRef,
constants).
Assisted-by: Claude:claude-opus-4-7:Claude Code
Siegfried Pammer