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PackageKitBackend: Rework fetching dependencies, fix missing link button

ivan tkachenko requested to merge work/ratijas/fix-dependencies-linkbutton into master

Due to the reliance of a one-time job's signal delivery, the Dependencies button went missing after the second time resource's page is opened. This patch refactor the whole task into:

  • a job class which collects a list of resources from PackageKit transaction;
  • a job runner class which launches the job on demand, keeps the result, and takes care not to launch two jobs simultaneously.
  • a data class (QGadget) to replace JSON object approach.

The runner is lazy, and also supports changing package ID (in case it changes after install/remove operation).

As a drive-by change, refactor list view delegate to wrap the whole summary text, because there is absolutely no reason for eliding.

Edited by ivan tkachenko

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