7cf2dbdf37
Specifically: * Handle null styles in TextSpan without crashing in toString(). * Handle null children in TextSpan child lists without crashing in toString(). * Handle entirely empty TextSpans in toString() explicitly. * Assert that TextSpans don't contain nulls in various places. This is done more often than one might think necessary, because it turns out that TextSpan takes a (mutable) List for one of its arguments, so who knows what it will contain at any given time. By asserting all over the place, hopefully we'll catch it near the change if they do change it. * Add a RichText example to Stocks to exercise RichText and TextSpans. See also: https://github.com/flutter/flutter/issues/2514, https://github.com/flutter/flutter/issues/2519
Flutter
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