Complete indented and quoted string correctly

def foo
    ''.upca[TAB]

This will be completed to be:

  def foo
  ''.upcase

The indent was gone. This commit fixes the bug.

lib/reline/line_editor.rb

@@ -905,7 +905,6 @@ class Reline::LineEditor
         quote = nil
         i += 1
         rest = nil
-        break_pointer = nil
       elsif quote and slice.start_with?(escaped_quote)
         # skip
         i += 2
@@ -915,7 +914,7 @@ class Reline::LineEditor
         closing_quote = /(?!\\)#{Regexp.escape(quote)}/
         escaped_quote = /\\#{Regexp.escape(quote)}/
         i += 1
-        break_pointer = i
+        break_pointer = i - 1
       elsif not quote and slice =~ word_break_regexp
         rest = $'
         i += 1
@@ -937,6 +936,11 @@ class Reline::LineEditor
       end
     else
       preposing = ''
+      if break_pointer
+        preposing = @line.byteslice(0, break_pointer)
+      else
+        preposing = ''
+      end
       target = before
     end
     [preposing.encode(@encoding), target.encode(@encoding), postposing.encode(@encoding)]

test/reline/test_key_actor_emacs.rb

@@ -1325,6 +1325,37 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
     assert_line('foo_ba')
   end
 
+  def test_completion_with_indent
+    @line_editor.completion_proc = proc { |word|
+      %w{
+        foo_foo
+        foo_bar
+        foo_baz
+        qux
+      }.map { |i|
+        i.encode(@encoding)
+      }
+    }
+    input_keys('  fo')
+    assert_byte_pointer_size('  fo')
+    assert_cursor(4)
+    assert_cursor_max(4)
+    assert_line('  fo')
+    assert_equal(nil, @line_editor.instance_variable_get(:@menu_info))
+    input_keys("\C-i", false)
+    assert_byte_pointer_size('  foo_')
+    assert_cursor(6)
+    assert_cursor_max(6)
+    assert_line('  foo_')
+    assert_equal(nil, @line_editor.instance_variable_get(:@menu_info))
+    input_keys("\C-i", false)
+    assert_byte_pointer_size('  foo_')
+    assert_cursor(6)
+    assert_cursor_max(6)
+    assert_line('  foo_')
+    assert_equal(%w{foo_foo foo_bar foo_baz}, @line_editor.instance_variable_get(:@menu_info).list)
+  end
+
   def test_completion_with_indent_and_completer_quote_characters
     @line_editor.completion_proc = proc { |word|
       %w{
@@ -1336,11 +1367,11 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
         i.encode(@encoding)
       }
     }
-    input_keys('  "".foo_')
-    assert_byte_pointer_size('  "".foo_')
-    assert_cursor(9)
-    assert_cursor_max(9)
-    assert_line('  "".foo_')
+    input_keys('  "".fo')
+    assert_byte_pointer_size('  "".fo')
+    assert_cursor(7)
+    assert_cursor_max(7)
+    assert_line('  "".fo')
     assert_equal(nil, @line_editor.instance_variable_get(:@menu_info))
     input_keys("\C-i", false)
     assert_byte_pointer_size('  "".foo_')