Extension Methods' classes have methods with same names and parameters.
e.g. Text<T>(this Efl.Ui.ItemFactory<T> fac)
Although the where clause contains different classes, they cannot be
identified as different methods by C# compiler.
e.g. Text<T>(this Efl.Ui.ItemFactory<T> fac) where T : Efl.Ui.Button
e.g. Text<T>(this Efl.Ui.ItemFactory<T> fac) where T : Efl.Ui.Check
As a result, to avoid ambiguous methods, ExtensionTag should be used as
a second parameter of each method.
e.g. Text<T>(this Efl.Ui.ItemFactory<T> fac, ExtensionTag<Efl.Ui.Button, T>magic = null) where T : Efl.Ui.Button
e.g. Text<T>(this Efl.Ui.ItemFactory<T> fac, ExtensionTag<Efl.Ui.Check, T>magic = null) where T : Efl.Ui.Check
This reverts commit 76631f502a.
Jaehyun Cho
700d87b370