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Opened by Gert Wollny@gerddie

OpenGL2/vtkShader compilation reports failure when it is called a second time without changin the source code.

The compilation fails in the second run because after the first run, the shader->Dirty member variable is set to false and Compile function starts like this:

bool vtkShader::Compile()
{
   if (this->Source.empty() || this->ShaderType == Unknown || !this->Dirty)
   {
       return false;
   }

One would expect that this functions returns true if !this->Dirty.