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Implement simple Quick Look plugins that generate a preview and/or
thumbnail image using Apple's latest Quick Look APIs. The approach
is to load and render any thumbnail images that may have been
embedded in .od* files when they were last saved.
Fortunately, LibreOffice, OpenOffice, and NeoOffice have been
saving thumbnail images by default in .od* files since at least
the mid-2000s so this approach should work with most unencrypted
.od* files.
Note: the plugins appear to work in unsigned builds using the
following steps to enable them:
1. Install LibreOfficeDev.app from an unsigned .dmg (e.g. nightly
master builds) but the plugins in instdir/LibreOfficeDev.app
in a local build are not usable.
2. Launch LibreOfficeDev.app to register the plugins.
3. Launch the System Preferences application, navigate to the
Login Items & Extensions panel, and in the Extensions section,
click on the icon next to the Quick Look entry to see a list of
installed extensions.
4. If macOS has successfully found and loaded the plugins, there
should be two extensions listed under LibreOfficeDev. If they
are disabled, enable both.
5. Press Command-Option-Escape, select the Finder in the dialog
that appears, and press the Relaunch button.
The Finder should now display the thumbnail images in .od* files.
Change-Id: I094afbc56b684cc85b12ed996e060818bfe8ad46
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/178393
Reviewed-by: Patrick Luby <guibomacdev@gmail.com>
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
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