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Prevent some precision troubles on some compilers when working with vector3d<s32>. Thx @AReichl for bugfix.


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- CGUICheckBox no longer gives up focus on EMIE_LMOUSE_LEFT_UP (thx @Demre for reporting http://irrlicht.sourceforge.net/forum/viewtopic.php?f=1&t=49598)


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Bugfix: IGUIElement::addChild now prevents setting an element as it's own child (fixes for example a crash in the GUI-editor).


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Note about implementation: There is already IVideoDriver::getScreenSize() which is more or less the getter for this function. But I don't think it belongs in IVideoDriver and also this function is about the window and not the screen obviously. So might make sense adding getWindowSize and deprecating getScreenSize, but that needs further changes in GUI. For now I just added a comment and let the rest be as it was.

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A few minor changes to the GUIEditor:
- Displays the window-size
- Update (rarely) when Window now active
- Sleep after drawing to prevent update-delays on resizing
- Driver choice now only for available drivers
- Kick out the "Tools" tab as it's unused so far and just irritating users.


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- Makefile for the new IrrFontTool links now correctly to libfontconfig


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Add ISceneNodeAnimator::setStartTime/getStartTime to allow resetting movement animators. This should work for:
CSceneNodeAnimatorFlyStraight, CSceneNodeAnimatorFlyCircle, CSceneNodeAnimatorFollowSpline, CSceneNodeAnimatorTexture.
It's also implemented for CSceneNodeAnimatorRotation, but that one currently resets the StartTime constantly (I don't think 
it has to, but I have no tests written for animators currently so can't change that for now).


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Get Irrlicht to compile with IRRLICHT_FAST_MATH on Linux (out-define code which was written for VS and remove #warn which is not a preprocessor command recognized by GCC).
Note that I did this just to do some tests against the fast-math functions - and those tests showed a lot of troubles so I still won't recommend using IRRLICHT_FAST_MATH.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4672 dfc29bdd-3216-0410-991c-e03cc46cb475

Make key-release events also show the correct Char value on Windows (thx @zerochen for report+fix here: http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=49499)

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Changing calling convention for static lib release fast CPU to Cdecl because FastCall did not actually compile (conflicts with pnglib). Also the same setting is used when compiling as dll, so I guess this setting was simply not tested. Thanks @AReich for reporting. See thread for more info:  http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=49462

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Improve speed for finalizing skinned meshes (removal of unnecessary frames after loading) (thx @ichtyander for the testmodel)
Down from ~20 seconds to ~0,5 seconds :-)


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Collada loader now instantiates camera nodes which had been ignore so far (thx @NemoStein for the test .dae)

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Revert VS10 project file to previous version as it got accidentally checked in with static linking enabled (sorry).

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vector2d::equals now has an tolerance parameter for passing the epsilon (like vector3d has already). Note that this changes the default behavior of vector2d::equals as well as functions using it like the operators for ==, !=, <, >, <=, >= when using vector2d with f64 as the tolerance is increased in that case (for f32 and integer values it shouldn't make any difference).

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Merge near identical code in CTriangleSelector::createFromMesh and CTriangleSelector::updateFromMesh (createFromMesh now using updateFromMesh).

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- Fix crash in SoftwareDriver2 when Material was EMT_DETAIL_MAP but texture[1] was not set (Thanks for fix by chronologicaldot)
- Fix issue in CAnimatedMeshSceneNode::clone which cause crash. (reported and fixed by luthyr)

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