Select multiple files and folders with checkmarks (fixes #1791)

Archisman Panigrahirequested to merge
apandada1/thunar:checkmark-multi-select into master

This merge request implements the feature that multiple files and folders can be selected by clicking on checkboxes (with this, one can select multiple files without touching the ctrl key of the keyboard). This is a popular feature in Microsoft Windows, and many users have wanted this across different GNU/Linux file managers (see #1791, https://github.com/orgs/linuxmint/discussions/353, https://askubuntu.com/questions/1120775/how-to-enable-check-box-in-file-managers).

It may also help touch screen users select multiple files.

It works on all of icon view, detailed view and compact view (see video):

The checkboxes appear on hover, and persist for selected items, just like the behavior on Windows.

The feature can be completely turned off in the settings:

image

This will close #1791

Edited by Archisman Panigrahi

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