Mehmet Fidanboylu d868044e50 Selectively apply margin between middle and leading (#11964)
* Selectively apply margin between middle and leading

If ToolbarLayout does not have a leading widget, we should not put a margin between leading and middle areas since it ends up being blank space that looks odd. Fixes https://github.com/flutter/flutter/issues/11963

* Fix the failing test which is a good test case for missing leading widget
2017-09-07 17:40:58 -07:00
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2017-09-07 16:57:38 -07:00