Revert "Disable overwrites when no-ansi is present, fixes #3612"

This reverts commit e0d36e19eb.

Conflicts:
	src/Composer/IO/ConsoleIO.php

src/Composer/IO/ConsoleIO.php

@@ -163,15 +163,6 @@ class ConsoleIO extends BaseIO
             $output = $this->output;
         }
 
-        if (!$output->isDecorated()) {
-            if (!$messages) {
-                return;
-            }
-
-            $this->doWrite($messages, count($messages) === 1 || $newline, $stderr);
-            return;
-        }
-
         // messages can be an array, let's convert it to string anyway
         $messages = join($newline ? "\n" : '', (array) $messages);
 

tests/Composer/Test/IO/ConsoleIOTest.php

@@ -99,27 +99,21 @@ class ConsoleIOTest extends TestCase
             ->method('write')
             ->with($this->equalTo('something (<question>strlen = 23</question>)'));
         $outputMock->expects($this->at(1))
-            ->method('isDecorated')
-            ->willReturn(true);
-        $outputMock->expects($this->at(2))
             ->method('write')
             ->with($this->equalTo(str_repeat("\x08", 23)), $this->equalTo(false));
-        $outputMock->expects($this->at(3))
+        $outputMock->expects($this->at(2))
             ->method('write')
             ->with($this->equalTo('shorter (<comment>12</comment>)'), $this->equalTo(false));
-        $outputMock->expects($this->at(4))
+        $outputMock->expects($this->at(3))
             ->method('write')
             ->with($this->equalTo(str_repeat(' ', 11)), $this->equalTo(false));
-        $outputMock->expects($this->at(5))
+        $outputMock->expects($this->at(4))
             ->method('write')
             ->with($this->equalTo(str_repeat("\x08", 11)), $this->equalTo(false));
-        $outputMock->expects($this->at(6))
-            ->method('isDecorated')
-            ->willReturn(true);
-        $outputMock->expects($this->at(7))
+        $outputMock->expects($this->at(5))
             ->method('write')
             ->with($this->equalTo(str_repeat("\x08", 12)), $this->equalTo(false));
-        $outputMock->expects($this->at(8))
+        $outputMock->expects($this->at(6))
             ->method('write')
             ->with($this->equalTo('something longer than initial (<info>34</info>)'));