leaflet: Add 'progress' child property

Signed-off-by: Alexander Mikhaylenko <alexm@gnome.org>
11 jobs for wip/exalm/leaflet-transltions in 19 minutes and 7 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed api-visibility #840501

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passed build-debian-clang #840503

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passed build-debian-gcc #840502

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passed build-fedora-gcc #840504

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passed build-flatpak #840505
flatpak

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passed build-flatpak-glade #840506
flatpak

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  Test+Docs
passed build-gtkdoc #840507

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passed unit-test #840508

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44.7%
 
  Package
passed package-debian-buster #840509

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  Test Package
passed autopkgtest-debian-buster-package #840510

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passed lintian-debian-buster-package #840511

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