Hinted Entry should have clear icon

[Julien Spautz]

The hinted entry should have a built-in symbolic clear button on the right end of the entry that only shows up when the entry is not empty.

Maybe the constructor should have a boolean argument to enable/disable the feature. There could also be a property for this.

The searchbar would also profit from this, since it's a subclass of the hinted entry.

[Cody Garver (codygarver)]

lib/Widgets/Entries.vala already uses a symbolic clear icon, where else should there be one?

[Julien Spautz (julien-spautz)]

The HintedEntry does not have a built-in clear icon. Only the Searchbar class has one. Yet some people might want to use it in a normal HintedEntry, so maybe we could put the clear icon into the HintedEntry class. I just think it would be more convenient.

The constructor could look like this for compatibility:

 public HintedEntry (string hint_string, bool has_clear_icon = false);