Fix QuickView popover being in the wrong pane
fix 2 issues after merge
Merge pull request #8976 from MarcelGerber/quick-view-splitview

Fix QuickView popover being in the wrong pane
Update CodeMirror to the latest.
Merge pull request #8994 from adobe/rlim/codemirror-for-44

Update CodeMirror to the latest.
Merge pull request #8990 from adobe/jeff/splitview-fixes

Fix 2 issues in DocumentManager Deprecated APIs