Add threaded loading to QBrowser

[qgib]

Author Name: Nathan Woodrow (@NathanW2)
Original Redmine Issue: 4257
Affected QGIS version: master
Redmine category:data_provider

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At the moment loading a folder with a large amount of files locks up the QGIS UI. This doesn't feel good from a user experience point of view, with no progress bar or indication of how long it will take the user is left wondering what is going on.

Suggestion: Load files into the QBrowser using a separate thread in order to keep the UI responsive. Also having a progress bar at the bottom of the dock with loading status would be a good idea IMO.

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• category_id was configured as Data Provider

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was configured as Version 1.7.4

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• crashes_corrupts_data was configured as 0
• version was configured as master
• fixed_version_id was changed from Version 1.7.4 to Version 1.8.0

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• fixed_version_id was changed from Version 1.8.0 to Version 2.0.0

[qgib]

Author Name: Martin Dobias (@wonder-sk)

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• assigned_to_id removed Martin Dobias

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• fixed_version_id was changed from Version 2.0.0 to Future Release - Lower Priority

[qgib]

Author Name: Radim Blazek (@blazek)

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The browser loading in threads is implemented in master and will be released in 2.8.

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed