Different length of evaluated output in REPL and during doctests.

[aborzunov]

I have an example in my index.md that produces an error that originates from the fact, that during doctests evaluated output is being shortened, but not in REPL.

```jldoctest demo
julia> y = u_init.( Xₙ[n] for n in 2:N )
39-element Array{Float64,1}:
 -8.010340876819335
 -8.017828522120382
 -8.006733491677299
 -7.958156688432881
 -7.833646561079693
 -7.5583895218691985
 -7.000181421210685
 -5.970893714323723
 -4.324519390104715
 -2.1875
 -0.049230609895282385
  1.6008937143237265
  2.636431421210687
  3.203389521869199
  3.489896561079693
  3.628156688432881
  3.6929834916772997
  3.7228285221203827
  3.7365908768193337
  3.7433666563569172
  3.747490716170851
  3.7510192650881646
  3.754925504812066
  3.759669571706625
  3.7654689144584026
  3.7724262699047735
  3.780590172256178
  3.7899835485135176
  3.8006172288624214
  3.8124963291732765
  3.8256232660239555
  3.8399991809276504
  3.8556246130976035
  3.872499817240246
  3.890624913670404
  3.9099999592207864
  3.930624980737263
  3.9524999909009275
  3.975624995701903

When i build docs i have the error:

┌ Error: doctest failure in src/index.md:62-104
│
│ ```jldoctest demo
│ julia> y = u_init.( Xₙ[n] for n in 2:N )
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│  -0.049230609895282385
│   1.6008937143237265
│   2.636431421210687
│   3.203389521869199
│   3.489896561079693
│   3.628156688432881
│   3.6929834916772997
│   3.7228285221203827
│   3.7365908768193337
│   3.7433666563569172
│   3.747490716170851
│   3.7510192650881646
│   3.754925504812066
│   3.759669571706625
│   3.7654689144584026
│   3.7724262699047735
│   3.780590172256178
│   3.7899835485135176
│   3.8006172288624214
│   3.8124963291732765
│   3.8256232660239555
│   3.8399991809276504
│   3.8556246130976035
│   3.872499817240246
│   3.890624913670404
│   3.9099999592207864
│   3.930624980737263
│   3.9524999909009275
│   3.975624995701903
│ ```
│
│ Subexpression:
│
│ y = u_init.( Xₙ[n] for n in 2:N )
│
│ Evaluated output:
│
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│   ⋮
│   3.8256232660239555
│   3.8399991809276504
│   3.8556246130976035
│   3.872499817240246
│   3.890624913670404
│   3.9099999592207864
│   3.930624980737263
│   3.9524999909009275
│   3.975624995701903
│
│ Expected output:
│
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│  -0.049230609895282385
│   1.6008937143237265
│   2.636431421210687
│   3.203389521869199
│   3.489896561079693
│   3.628156688432881
│   3.6929834916772997
│   3.7228285221203827
│   3.7365908768193337
│   3.7433666563569172
│   3.747490716170851
│   3.7510192650881646
│   3.754925504812066
│   3.759669571706625
│   3.7654689144584026
│   3.7724262699047735
│   3.780590172256178
│   3.7899835485135176
│   3.8006172288624214
│   3.8124963291732765
│   3.8256232660239555
│   3.8399991809276504
│   3.8556246130976035
│   3.872499817240246
│   3.890624913670404
│   3.9099999592207864
│   3.930624980737263
│   3.9524999909009275
│   3.975624995701903
│
│   diff =
│    39-element Array{Float64,1}:
│     -8.010340876819335
│     -8.017828522120382
│     -8.006733491677299
│     -7.958156688432881
│     -7.833646561079693
│     -7.5583895218691985
│     -7.000181421210685
│     -5.970893714323723
│     -4.324519390104715
│     -2.1875
│     -0.049230609895282385
│      1.6008937143237265
│      2.636431421210687
│      3.203389521869199
│      3.489896561079693
│      3.628156688432881
│      3.6929834916772997
│      3.7228285221203827
│      3.7365908768193337
│      3.7433666563569172
│      3.747490716170851
│      3.7510192650881646
│      3.754925504812066
│      3.759669571706625
│      3.7654689144584026
│      3.7724262699047735
│      3.780590172256178
│      3.7899835485135176
│      3.8006172288624214
│      3.8124963291732765
│      -2.1875
│      ⋮
│      3.8256232660239555
│      3.8399991809276504
│      3.8556246130976035
│      3.872499817240246
│      3.890624913670404
│      3.9099999592207864
│      3.930624980737263
│      3.9524999909009275
│      3.975624995701903
└ @ Documenter.DocTests ~/.julia/packages/Documenter/BZNsm/src/DocTests.jl:364

Truncating with [...] also doesn't help.

Error: doctest failure in src/index.md:62-77
│
│ ```jldoctest demo
│ julia> y = u_init.( Xₙ[n] for n in 2:N )
│
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│  [...]
│ ```
│
│ Subexpression:
│
│ y = u_init.( Xₙ[n] for n in 2:N )
│
│ Evaluated output:
│
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│   ⋮
│   3.8256232660239555
│   3.8399991809276504
│   3.8556246130976035
│   3.872499817240246
│   3.890624913670404
│   3.9099999592207864
│   3.930624980737263
│   3.9524999909009275
│   3.975624995701903
│
│ Expected output:
│
│
│ 39-element Array{Float64,1}:
│  -8.010340876819335
│  -8.017828522120382
│  -8.006733491677299
│  -7.958156688432881
│  -7.833646561079693
│  -7.5583895218691985
│  -7.000181421210685
│  -5.970893714323723
│  -4.324519390104715
│  -2.1875
│  [...]
│
│   diff =
│
│    39-element Array{Float64,1}:
│     -8.010340876819335
│     -8.017828522120382
│     -8.006733491677299
│     -7.958156688432881
│     -7.833646561079693
│     -7.5583895218691985
│     -7.000181421210685
│     -5.970893714323723
│     -4.324519390104715
│     -2.1875
│     [...]-2.1875
│      ⋮
│      3.8256232660239555
│      3.8399991809276504
│      3.8556246130976035
│      3.872499817240246
│      3.890624913670404
│      3.9099999592207864
│      3.930624980737263
│      3.9524999909009275
│      3.975624995701903
└ @ Documenter.DocTests ~/.julia/packages/Documenter/BZNsm/src/DocTests.jl:364

[mortenpi]

I think in the REPL it depends on how large your REPL window is? When running doctests, we use some default value (not sure what exactly, but there is some default IOContext is presume?).

I'd say that this is related to #942, but I don't think there is a bug here. I'd suggest you just use the string Documenter produces (see Fixing Outdate Doctests to automatically fix all your doctests).

[aborzunov]

I found that changing my terminal size affects output length and height, so even if i could control width and height like #942 proposes, i don't know what value i should use.

So this is kind of duplicate #942