D6938: [Folder View Config] Make model writable and drop custom setRowChecked method

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  By implementing `setData` we make the `model` magic property writable and can directly assign `model.checked` a new value.
  Not only is this cleaner but it will just work with proxy models.

TEST PLAN
  Changed some preview plugins, applied settings, preview plugins were loaded/unloaded as desired.
  Changed some mimetype filters, applied settings, files showed up anddisappeared as desired.
  
  (The FilterableMimeTypesModel can probably be removed and replaced by a Plasma SortFilterModel)

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D6938

AFFECTED FILES
  containments/desktop/package/contents/ui/ConfigFilter.qml
  containments/desktop/package/contents/ui/FolderItemPreviewPluginsDialog.qml
  containments/desktop/plugins/folder/mimetypesmodel.cpp
  containments/desktop/plugins/folder/mimetypesmodel.h
  containments/desktop/plugins/folder/previewpluginsmodel.cpp
  containments/desktop/plugins/folder/previewpluginsmodel.h

To: broulik, #plasma, hein
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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