Fix so undoing complex operations in TextEdit
will restore selections
#86118
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Fixes #72769
When doing a complex operation in TextEdit (using
begin_complex_operation
andend_complex_operation
to start and end them), undoing one of these operations should have restored the original text selections, however in some cases (especially with multicarat selections), the selections wouldn't be properly restored.It seems that there was an effort to code this in before, but it was either not finished or more likely broken by subsequent code changes. This PR fixes this using the existing system.