Bug: Deeply nested if statements do not work correctly

[davesmith00000]

Example, something like:

if .. then
  if ... then vec2(0.0f)
  else if ... then vec2(0.0f)
  else vec2(0.0f)
else if ... then
  vec2(0.0f)
else
  vec2(0.0f)

Will pass Scala compilation but will not be valid GLSL.

[davesmith00000]

Needs investigation to see what needs to be done.