A small improvement in design of Matrix component

[sgurukrupa]

One immediate suggestion would be to include a MatrixRow component in Matrix; refer to Nested components. The MatrixRow component would represent a row in the matrix. Hence move all row specific Svelte Tags into MatrixRow component. Other than this I see your design is the best one could come up with.

[frafra]

@sgurukrupa Thank you for your feedback!