Change view buttons icons.

Use symbolic icons.
Add a tab widget.

For now the tab bar stays hidden.
Open places when activated.

Open a places view item when it's activated.
Elide icon text from right.

Change the elide text property.
Change permissions.

Change permissions using the file properties dialog.
Default application checkbox label.

Change it to "Always open with selected application".
Add stacked widget for single file or multiple files mode

When the information dialog is requested for a single file it will be
possible to change the name, when information for multiple files is
requested read-only information are shown.