Revision history for Perl extension Tk::HListbox.

1.0    Mon May 25, 2015
	- original version; Derived from Tk::HList and Tk::Listbox, 
	  created by h2xs 1.23 with options -X -n Tk::HListbox
2.0
	- Massive cleanup of bindings to make work more exactly like Tk::Listbox.
	  * Added Tk::Listbox's -listvariable option and bbox() function.
	  This is implemented using the existing TIE @array feature.
	  Tk::HListbox previously used Tk::HList's "anchor" as it's "active" 
	  indicator since Tk::HList does not have the concept of an "active" 
	  entry, but now we use a hidden "virtual anchor" variable allowing 
	  us to maintain a proper select anchor while still using Tk::HList's 
	  anchor as the "active" cursor.
	  * Added Tk::HList's hide() and show() functions and -command callback.
	  * Added an image-only option (-itemtype => 'image').
	  * Found and fixed numerous little issues and descrepencies.
	  It should now be possible to use Tk::HListbox as a complete drop-
	  in replacement for Tk::Listbox in existing code while simply adding 
	  any additional Tk::HListbox features, such as images, indicators, 
	  and callbacks as needed.
2.1
	- * Added "-state" to the list of dynamically-configurable options, ie. 
	  developers can now do "$lb->configure(-state => <state>);" and have 
	  it work.
	  * Fixed get() function to work like Tk::Listbox->get() and FAIL if 
	  no arguments (indices) given.
2.2	  Tue Jul 31, 2018
	- * Made "-state => 'disabled'" actually work.  Pbm. is that the 
	  underlying HList widget does NOT support disabling, so we had to 
	  manually emulate the feature by removing focusability, changing 
	  the foreground color, disable selecting items, etc. and then the 
	  ability to restore previous state when re-enabled, in order to 
	  work like a normal Tk::Listbox.
	- * Fixed issues involving setting background & foreground colors 
	  and allow taking advantage of our custom setPalette.pl module to 
	  properly render the "active element"'s background.
	  Color options should now work more like they do in Tk::Listbox.
	- * Added fixPalette() function for the rare cases it doesn't.weq
	- * Added -showimage, -showtext, and -bitmap options to the 
	  itemconfigure() function to be directly handled without it having 
	  to create an itemStyle, as these are supported in the Tk::DItem docs.
	- * Added -activeforeground, -selectforeground, and -selectbackground 
	  options.
	- * Fixed potential issue of improperly inserting text-only entries 
	  specified in hashref format, where either the wrong itemtype was 
	  being used causing an error, or the "-data" structure was being 
	  duplicated.
	- * Made -font option actually work.  Default is "{MS Sans Serif} 8" on 
	  M$-Windows and "Helvetica -12 bold" otherwise, the defaults used by 
	  Tk::Listbox and Tk::HMListbox.
	- * REGRESSION:  Due to the color-related changes above, other style options 
	  applied to individual entries are actually applied to all entries of 
	  that type, ie. all "imagetext", or all "text", etc. entries in the list.
	  To apply custom style options to individual entries now, one must define 
	  a custom ItemStyle, due to the fact that to get the color optinos to work 
	  properly, we now create a "default ItemStyle" for each of the three valid 
	  "type"s and style options are applied to those (unless a 
	  "-style => $customItemStyle" is specified for the entry).