Warn compile_error only when input is finished

Let's say we are in progress to write `"foo"`:

```
irb> "fo
```

at this moment, nothing is wrong.
It would be just a normal way to write `"foo"`.

Prior to this commit, the `fo` part was warned because of
5b64d7ac6e7cbf759b859428f125539e58bac0bd. But I think warning such a
normal input is not valuable for users.

However, we'd like to warn `:@1` or `@@1` which is also a syntax error.
Then this commit switches the syntax highlight based on whether the
input text is finished or not. When it's not finished yet, it does not
warn compile_error.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index a8a3f67474..acdc9a2f9c 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -436,6 +436,8 @@ class Reline::LineEditor
     line = modify_lines(whole_lines)[@line_index]
     if @is_multiline
       if finished?
+        # Always rerender on finish because output_modifier_proc may return a different output.
+        render_partial(prompt, prompt_width, line)
         scroll_down(1)
         Reline::IOGate.move_cursor_column(0)
         Reline::IOGate.erase_after_cursor
@@ -498,7 +500,7 @@ class Reline::LineEditor
   private def modify_lines(before)
     return before if before.nil? || before.empty?
 
-    if after = @output_modifier_proc&.call("#{before.join("\n")}\n")
+    if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: finished?)
       after.lines(chomp: true)
     else
       before