Show validation errors when filter is validated

Signed-off-by: Byron Ruth <b@devel.io>
Always reset collection text is parsed

This fixes a performance issue that caused multiple re-renderings of
the textarea when pasting in a large list of values. The previous
behavior using Collection#set caused the re-render to happen on every
add/remove event of an item. The fix ensures only one render happens
for the batch.

Signed-off-by: Byron Ruth <b@devel.io>
Merge pull request #603 from cbmi/issue-596

Show validation errors when filter is validated