TinyMCE: revert https://github.com/tinymce/tinymce/commit/158b7424103a02f579bd2bd0cd18f91d1b5e2183 and https://github.com/tinymce/tinymce/commit/576fa77aa20c7e029adb4bce5cab4bf3654cd58a as they may cause selection restore problems in old IE. See #28391.
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