feat(ui): spin the arrow on "Check now" and "Check again" - #982

XML comment has badly formed XML -- 'Whitespace is not allowed at this location.'

XML comment has badly formed XML -- 'Whitespace is not allowed at this location.'

Nullable value type may be null.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'collection' in 'void Assert.Contains<string>(string expected, IEnumerable<string> collection)'.

Ambiguous reference in cref attribute: 'DocumentReaders.DecodeText'. Assuming 'Filee.Engines.Hwp.Hwpx.DocumentReaders.DecodeText(byte[])', but could have also matched other overloads including 'Filee.Engines.Hwp.Hwpx.DocumentReaders.DecodeText(byte[], int)'.

'IPdfImage.Bounds' is obsolete: 'Use BoundingBox instead.'

'Letter.GlyphRectangle' is obsolete: 'Use BoundingBox instead.'