Pros:
- ShowDBProperties doesn't reset column layout
- Sort direction is remembered automatically
- Reading columnlist from registry is done once in a TMDIChild, not on each ShowDBProperties
- Hiding/unhiding columns doesn't call ShowDBProperties
- No more hassling with what is called a "default column" or not. popupDBGrid is usable like in Windows Explorer.
- Column layout is stored global, not per session.
Cons:
- Column layout from old settings logic needed to be discarded
Side effect:
- Fixes a potential AV in FormatNumber(str) with empty strings.
- Created an overloaded FormatByteNumber() which can take a string as input
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