Fix: Multiline input broken in Julia executable fold

[Parth-Garg2629]

Description:
The line (when (supports-julia?) (plugin-input-converters julia)) in init-julia.scm accidentally sets (plugin-supports-math-input-ref "julia") to #t, which causes plugin-preprocess to strip newline characters. This breaks multiline code in executable folds (Insert → Fold → Executable).

Example broken output:

# All lines are concatenated into one — multiline logic fails silently
using Random Random.seed!(42) rand()

Expected Behavior: Multiline Julia code in executable folds should be preserved and executed correctly.

Proposed Fix Direction: Guard plugin-input-converters against unintended math-input mode activation, or explicitly set plugin-supports-math-input-ref to #f for Julia.

[Parth-Garg2629]

what are your views about it @mgubi @hammerfunctor

[hammerfunctor]

The problem line even fails in a julia terminal. What's the point here?

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.12.4 (2026-01-06)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org release
|__/                   |

julia> using Random Random.seed!(42) rand()
ERROR: ParseError:
# Error @ REPL[1]:1:13
using Random Random.seed!(42) rand()
#           └──────────────────────┘ ── extra tokens after end of expression
Stacktrace:
 [1] top-level scope
   @ REPL:1

[Parth-Garg2629]

The problem line even fails in a julia terminal. What's the point here?

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.12.4 (2026-01-06)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org release
|__/                   |

julia> using Random Random.seed!(42) rand()
ERROR: ParseError:
# Error @ REPL[1]:1:13
using Random Random.seed!(42) rand()
#           └──────────────────────┘ ── extra tokens after end of expression
Stacktrace:
 [1] top-level scope
   @ REPL:1

the single line you typed is exactly what the plugin was producing because it was stripping out all the newlines. Since Julia obviously can't handle multiple statements on one line like that, it was throwing the ParseError. My fix stops the plugin from squashing everything into one line, so it sends the code to Julia exactly as it's written in the editor. Once the newlines are preserved, it runs perfectly

[hammerfunctor]

Sorry I understand it after reading your texts. Fully removing math preprocessing is really not a ``solution'' to this issue and to solve it properly one should redo the serialization for executable folds. An alternative workaround is to add ; to end of your lines inside executable folds which i suppose shall not be super heavy.

[Parth-Garg2629]

sure @hammerfunctor i'll look into it and make the necessary changes