Revision history for Perl extension Tk::SMListbox.

1.10  Tue Oct 13 22:21:54 2009
	- original version; created by h2xs 1.23 with options
		-X -n Tk::SMListbox
2.00	Wed Oct 21
	- Added setButtonHeight() function for resizing the height (pady) 
	  of the column header buttons.
	- Added column header button "underlined hotkey" capability for 
	  keyboard-controlled column sorting.  The optional hotkey in 
	  the column header (-text) values is preceded by a "~".
	- Added focusColumn() function.
2.01	Thu Oct 22
	- Fixed small bug in the focus() function to ensure that the 
	  widget properly takes focus.
2.10	Thu Apr 30, 2015
	- Fixed bug in columnDelete() when only a single column value passed.
	- Fixed bug where sometimes more than one column showed sort arrow.
	- Fixed bindCallback reference in columnInsert() to _bindCallback
	  (MListbox bug#60812).
	- Added -nocolumnfocus option to prevent first listbox from showing the 
	  focused "______" when using my "hacked" Tk::Listbox widget.
2.11	Not released.
2.12 Th Aug 2, 2018
	- Backported several options from Tk::HMListbox:  -fillcolumn, 
	  -headerforeground, -headerbackground, and -reversearrow.
	- Backported setSortOrder() function from Tk::HMListbox.
	- Fixed broken -focuscolumn option.
	- Renamed internal packages to prevent potential conflicts with 
	  Tk::MListbox.
	- Massively cleaned up and updated docs.
	- The usual code cleanups.
	- Tk::SMListbox should now be fully compatable w/Tk::HMListbox, 
	  except for using standard Tk::Listboxes instead of Tk::HListboxes.
2.13  Mon Jan 3, 2022
	- Remember item cursor is on & restore cursor when sorting.
	- Fix minor focus-traversal issue.
2.2   Sat Dec 17, 2022
	- Add support for "-state => 'disabled'".
	- Add (and document) -scrollbarfocus option.
	- Fix -takefocus issues.
	- General code and doc. cleanups.
	- Add bindings for the 2nd (horizontal) scrollwheel/device (buttons 6 and 
	  7) to scroll the widget horizontally when hovering over the horizontal 
	  scrollbar.
2.21  Fri Dec 31, 2022
	- Fix some mouse bindings to behave more like Listbox / HListbox.
	- A few minor code fixups.
	- Add a State button to the test suite to allow testing disabling.