Reset dialog when importing 3.x files is not honouring "Keep old style" and marking score dirty
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 184.108.40.2065303918, revision: github-musescore-musescore-
Open the example file, created in 3.5.2.
Up to MS 3.5., the reset dialog only opens when importing pre-MS3 files. Now, however, it is also appearing when you open 3.x files. And even if you chose "Keep old style", it still marks the score dirty. This is reversed if you UNDO. So, the suspicion is that the dialog is not fully honouring the "Keep old style" option.
Just as important, the dialog should not be opening at all for 3.x files.