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The integration tests are currently not consistent in how they do copy/pasting: some tests use the `kbCopy`/`kbPaste` functions with waiting for the event inline, some have their own helper function to combine those actions and some even call `kbCopy`/`kbPaste` without waiting for the event at all (which can cause intermittent failures). This commit fixes the issues by providing a set of four helper functions that all tests use and that abstract e.g. waiting for the event away from the caller. This makes the invididual tests simpler and consistent, reduces code duplication and fixes possible intermittent failures due to not waiting for events to trigger.