glsl preprocessor directives not parsed

[3Dickulus]

Description
glsl preprocessor directives #if #else #endif are not parsed by FragM
when enclosing sliders on both sides of the conditional both sets of sliders will be created

To Reproduce

// creates 2 Zoom sliders
#if VERSION >= 400
// Camera zoom
uniform double Zoom; slider[1e-4,1,1e64] Logarithmic NotLockable
#else
// Camera zoom
uniform float Zoom; slider[1e-4,1,1e7] Logarithmic NotLockable
#endif

// creates CenterX CenterY Center widgets
#if VERSION >= 400
// Camera center X in high precision (quad-double)
uniform dvec4 CenterX; slider[(-100,-100,-100,-100),(0,0,0,0),(100,100,100,100)] NotLockable
// Camera center Y in high precision (quad-double)
uniform dvec4 CenterY; slider[(-100,-100,-100,-100),(0,0,0,0),(100,100,100,100)] NotLockable
const dvec4 CenterShift = dvec4(1.0, 1.1102230246251565e-16LF, 1.232595164407831e-32LF, 1.3684555315672042e-48LF);
#else
// Camera center in single precision
uniform vec2 Center; slider[(-100,-100),(0,0),(100,100)] NotLockable
vec4 CenterX = vec4(Center.x, 0.0, 0.0, 0.0);
vec4 CenterY = vec4(Center.y, 0.0, 0.0, 0.0);
#endif

Expected behavior
create the correct sliders when VERSION < 400 or VERSION >= 400
1 Zoom slider
Center when < 400 or CenterX and CenterY when >= 400

Desktop:
Vendor: NVIDIA Corporation
Renderer: NVIDIA GeForce GTX 1650 SUPER/PCIe/SSE2
GL Driver: 4.5.0 NVIDIA 525.89.02
Display using GL 4.5 Core profile

Additional context