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Fix crash on text hint being triggered after disabling code browser plugin

Friedrich W. H. Kossebau requested to merge kossebau/kdevelop:ficrashoncodebrowserplugindisabling into 5.4

From KTextEditor::TextHintInterface::registerTextHintProvider() docs: "When the provider is about to be destroyed, make sure to call unregisterTextHintProvider() to avoid a dangling pointer." (new requirement with KF5)

The old code never unregistered in case the ContextBrowserPlugin was deleted (like it happens when disabling the plugin in the settings in a running KDevelop instance).

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