Improve consistency of code management.
JIRA issue: CORE-19278
- Move SHOpenPropSheetA from
utils.cpp into propsheet.cpp that
contains SHOpenPropSheetW.
- Implement SHOpenPropSheetW.
- Reuse already opened propertysheets and format dialogs by finding the existing unique stub window.
- Default .lnk property dialog to the shortcut tab.