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.
Label and input now share the same Panel slot inside a horizontal DockPanel —
the funnel icon docks right and exactly one of {label, input} is visible at a
time. Hovering the header (or setting a filter, or opening the popup) swaps
the column name out for the input; otherwise the label stays. Two-row stack
is gone, so the data-rows no longer shift down when an input gets revealed.
Assisted-by: Claude:claude-opus-4-7:Claude Code
Each metadata column header now shows a small funnel icon to the right of the
column name. The TextBox / dropdown trigger collapses by default and only
becomes visible when the pointer is over the header, when a filter is set, or
while the [Flags] popup is open. Active filters tint the funnel SteelBlue so
the user can see at a glance which columns are constraining the view.
Assisted-by: Claude:claude-opus-4-7:Claude Code
Replace the string-token flag predicate with a numeric bitmask on
ColumnFilter (FlagMask, default -1 meaning "all rows"). The dropdown
on a [Flags] column now drives the mask directly:
Assisted-by: Claude:claude-opus-4-7:Claude Code
A column filter wrapped in `/.../` is parsed as a case-insensitive
regex; anything else stays on the existing substring path. Unparseable
patterns fall through to a literal substring match so a typo can't
take down the filter row. Compiled regexes are cached per filter
text.
Assisted-by: Claude:claude-opus-4-7:Claude Code
Upgrade the integration filter test to drive the live DataGrid: locate
the TextBox the column builder embedded in the Name column's header,
set its Text, and assert on DataGridCollectionView.Count — the visible
row count the user actually sees. Drop the temporary verification
fixture; the regression coverage now lives alongside the predicate /
event-forwarding unit tests.
Assisted-by: Claude:claude-opus-4-7:Claude Code
The page now subscribes to its own ColumnFilters' PropertyChanged via
CollectionChanged and re-raises ColumnFilterChanged. The view listens
to that single event instead of chasing per-filter listeners on every
schema swap, which was leaving the auto-refresh path silent on the
running app even though the predicate itself was correct.
Assisted-by: Claude:claude-opus-4-7:Claude Code
The CommunityToolkit.Mvvm source generator over a `value` field interacts
poorly with Avalonia's INPC binding plugin: typing into the per-column
filter TextBox throws TargetException("Non-static method requires a
target") because the cached accessor's target reference comes back null
on write. Renaming the backing field and property avoids the collision
with the contextual `value` setter identifier.
Assisted-by: Claude:claude-opus-4-7:Claude Code
Replace the single text-bar above the grid with one filter input per
column, baked into each DataGridColumn's header. The page model carries
a ColumnFilters collection alongside Columns; the filter predicate ANDs
every non-empty column's case-insensitive substring match. Column
instances are built fresh per page so sibling tabs don't share filter
state, and the column name moves to Tag for cell-level lookups now that
Header is a Panel.
Assisted-by: Claude:claude-opus-4-7:Claude Code
FilterText on MetadataTablePageModel drives a case-insensitive Contains
predicate over each row's stringified property values; the view wraps
Items in a DataGridCollectionView so the filter applies without rebinding.
Assisted-by: Claude:claude-opus-4-7:Claude Code
Siegfried Pammer