Desktop test classes each kept identical PumpUntil, Show, Mouse, All,
PressKey, Raise, SetBackingField and Field helpers. They now import
FormTesting and TestReflection; the two Field variants that read a base
type's field or unwrap DrawingLibraryForm keep a one-line wrapper.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ten desktop test classes drew the same squares and the same 4 x 2
rectangle in private helpers, in two equivalent styles. They now use
TestPrograms.Square, ClockwiseSquare and Rectangle.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Expand now reads the plate on a worker while its Cancel window pumps
messages, so a still-running fill could commit parts into the plate the
search is enumerating (InvalidOperationException: collection modified).
Refuse the command while whole-job nesting, a NestProgressForm or a fill
on any view of the nest is active. The usual plate-action guard is not
reused: ActionSelect reports busy whenever parts are selected, which
Expand requires.