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71f7872251
This adds a new "locator" bar to the QGIS status bar. If you're not familiar with QtCreator's locator, it's a quick search bar (activated by Ctrl+K) which displays matching search results from any number of registered search filters. Search filters are subclassed from QgsLocatorFilter, and added to the app's locator via iface.registerLocatorFilter(...) Searching is handled using threads, so that results always become available as quickly as possible, regardless of whether any slow search filters may be installed. They also appear as soon as each result is encountered by each filter, which means that e.g. a file search filter will show results one by one as the file tree is scanned. This ensures that the UI is always responsive even if a very slow search filter is present (e.g. one which uses an online service). This framework is designed to be extended by plugins, such as OSM nominatim searches, direct database searching (i.e. Discovery plugin), layer catalog searches, etc...
