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What is new in GTK+ 1.1.0:
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* New widget GtkFontSelector.
* New featurefull progress bar.
* New container widget GtkPacker.
* New object GtkItemFactory, GtkMenuFactory is deprecated.
* New key binding system, configurable via rcfiles, similar to styles.
* New widget GtkCTree with drag selections and keyboard movement and
  and horizontal scrolling. Features also implemented for GtkCList.
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* Significant speedups to widget creation and destruction through caching
  colormap and visual queries to the XServer.
* Speedups for type creation and especially gtk_type_is_a() checks.
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* Speedups in signal lookup, creation and emissions and connection handling.
* Minor speedups with object data allocation and destruction.
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* Additions to the signal handling API (e.g. *_emitv).
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* Support for rc-file reparsing.
* Resizing logic is now implemented on container widget basis, rather than
  for toplevel GtkWindows only.
* Buttons support relief styles now.
* Some widgets are now allocated through memchunks to behave more memory wise.
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* Newly included file gtkfeatures.h which defines compatibility macros to
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  test for certain API features upon program compilation.
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* Child arguments support for container widgets.
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* Far better support for object arguments, revamp of the underlying
  mechanism for speed and reusability. Child/object arguments don't
  need to be preceeded by the "GtkType::" portion anymore.
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* Removed GtkAcceleratorTable in favour of GtkAccelGroup, accelerator display
  is now performed by a new widget GtkAccelLabel.
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* Overhaul of the resizing code. Resizing behaviour can now be specified
  on GtkContainer basis, so the underlying algorithm isn't only available
  for GtkWindows.
* GtkTables are now fully resizable.
* The GtkType system now supports an additional base class initialization
  function.
* GtkStyles and key bindings can now be looked up depending on the base
  types of a widget, through a new keyword `class' in rc files.
* GtkButton derives from GtkBin (finally).  
* More descriptive error messages on rc parsing.  
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* Runtime information is available to query enum/flag definition values.
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* Upgrade to libtool-1.2
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* Legions of bug fixes, memory leaks, segfaults, of-by-something errors...
  including those that already went into the 1.0.x branch.
* A big bunch of features and cosmetic fixups that just got lost in
  the masses of changes.