IGUIEnvironment::hasFocus has now a parameter checkSubElements as subelements are usually seen as part of an element. Default unfortunately must be false due to backward compatibility.

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- Added query feature related to DXT compressed textures.
- Added compressed textures support for D3D9.
- Fixed minor bugs in OpenGL related to compressed textures handling.
- Properly handle compressed textures in D3D8 and Software drivers (Those drivers doesn't support compressed textures).

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- Extended IImage class for support compressed textures.
- Improved DDS loader for support mip map loading.
- Added DXT1-5 compressed textures support for OpenGL.

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- Added partially (IImageCompressed part) support for compressed textures. Currently only DDS format is supported.

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(sorry commit-message got lost because I ignored some warning)
Also fixed a comment again which I accidentally messed up in last login.


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- In IGUICheckBox add: setDrawBackground, isDrawBackgroundEnabled, setDrawBorder, isDrawBorderEnabled
- Some minor function re-ordering in IGUIStaticText


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Again: IGUISpinBox now passes on the EGET_BUTTON_CLICKED, EGET_EDITBOX_CHANGED and EGET_EDITBOX_ENTER events from it's sub-elements (wasn't fixed with last check-in).

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- IGUISpinBox now passes on the EGET_BUTTON_CLICKED, EGET_EDITBOX_CHANGED and EGET_EDITBOX_ENTER events from it's sub-elements.
- IGUISpinBox no longer validates values after each character type but only on KEY_ENTER and when losing focus. New behavior can be set with IGUISpinBox::setValidateOn

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IAttributes::getAttributeAs functions now can have a customizable default-parameter to return when attributeName is not found. This makes it easier to work correctly with old serialized data when adding new variables. Also it would probably be worth it passing generally in all serialization the old value as default-parameter, then it can handle missing serialization data as well.

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Add a LeakHunter class which can be enabled with compile-flag _IRR_COMPILE_WITH_LEAK_HUNTER_ to find leaking IReferenceCounted objects.
Will break OSX compiling for now as that project file is not yet updated. I hope other project files are all fixed correctly.

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- Added ECFN_DISABLED value (it works like ECFN_NEVER worked before) and changed ECFN_NEVER behaviour (it works like its equivalent value in OpenGL/Direct3D).

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- Fixed issue with example no. 3 (other driver also need similar improvements -> move texture parameters update from OnSetMaterial/setBasicRenderStates to OnRender, because SMaterial compare operator doesn't check SMaterialLayer values).

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- Removed debug info drawing for a light in example no. 11.

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- Optimized rendering with ARB shaders in OpenGL.

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