1. Migrate custome scrollbar code from style-example-qt5.
2. Prepare for custome QLineEdit component.
3. Comment folder icon in location-bar.

When the screen geometry changed, window will be updated, but view item might be relayout in error places.
Refreshing the view will let an item restore its previous position in the view.

Remove useless fiels; update copyright;add keywords to desktop and change the install path; remove Breaks/Replaces; fix spelling errors; update the translation; add libpeony2.symbols

1. advance-search-bar：add setdefaultpath function.
2. use current path as default search path.

1. improve item's text role displaying.
2. fix the warning about setting font size.

1. limit trash operation.
2. improve trash operation error handler.
3. fix the error handler in delete operation.

1. drop sort order option.
2. fix the items displaying problem when changing view icon size.

desktop window: after double click clear current selection.