It adds an @AfterEach to TextAreaImageUploadIT that discards the unsaved changes, so a failing test no longer takes down every test running after it in the shared browser session. Verified with a full green AllIT run (17 tests).
The underlying flicker (problem 2, ckeditor.getToolBar().insertImage() not opening the image dialog within the 10s wait) is not fixed by that PR - this issue stays open for it.
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