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PROBLEM: Whenever any text edits are applied to the buffer, the `marks` part of those lines will be lost. This is mostly problematic for code formatters that format the whole buffer like `prettier`, `luafmt`, ... When doing atomic changes inside a vim doc, vim keeps track of those changes and can update the positions of marks accordingly, but in this case we have a whole doc that changed. There's no simple way to update the positions of all marks from the previous document state to the new document state. SOLUTION: * save marks right before `nvim_buf_set_lines` is called inside `apply_text_edits` * check if any marks were lost after doing `nvim_buf_set_lines` * restore those marks to the previous positions TEST CASE: * have a formatter enabled * open any file * create a couple of marks * indent the whole file to the right * save the file Before this change: all marks will be removed. After this change: they will be preserved. Fixes #14307