State has wrong behavior

This code:
```
auto currentState = globjects::State::currentState();
[...] // No state related code here

// Then change some state
globjects::ref_ptr state = new globjects::State(globjects::State::ImmediateMode); // Apply immediately all changes
state->pixelStore(gl::GL_UNPACK_ALIGNMENT, 1); // In components size
state->pixelStore(gl::GL_UNPACK_ROW_LENGTH, width/3); // In components size

[...]
currentState->apply();
```
Trigger this GL error:
```
error: 0x500, high severity (API)
GL_INVALID_ENUM error generated. Polygon modes for are disabled in the current profile.
```
The backtrace for this error is:
```
#0 Stitcher::Application::__lambda0::operator() (__closure=0x10ed440, message=...) at ../src/Application.cpp:478
#1 0x00000000005b3f6d in std::_Function_handler::_M_invoke(const std::_Any_data &, const globjects::DebugMessage &) (__functor=..., __args#0=...)
at /usr/include/c++/4.8.2/functional:2071
#2 0x0000000000623649 in globjects::DebugImplementation_DebugKHR::debugMessageCallback(gl::GLenum, gl::GLenum, unsigned int, gl::GLenum, int, char const*, void const*) ()
#3 0x00007fffece62b18 in ?? () from /lib64/libnvidia-glcore.so.367.57
#4 0x00007fffece62c60 in ?? () from /lib64/libnvidia-glcore.so.367.57
#5 0x00007fffece62f22 in ?? () from /lib64/libnvidia-glcore.so.367.57
#6 0x000000000068e1c2 in glbinding::Function::call(gl::GLenum&, gl::GLenum&) const ()
#7 0x00000000007383e2 in gl::glPolygonMode(gl::GLenum, gl::GLenum) ()
#8 0x000000000062c851 in globjects::State::apply() ()
```

Clearly, it's dealing with polygon mode which I've not touched in my code.
I wonder if the "currentState" is a good idea at all. It's slow (because it loops other all states to restore them). I wonder if a per-thread storage list of modified state wouldn't be better. That is, any state changed with a State instance would append the previous state to a TLS's list (if it's not found in the list beforehand, obviously), and a static restoreState() would pop all item from the TLS's list to restore all the current modified state and not *all* the states like it's done currently, thus avoiding the error written above.