BlueScreen: renderToFile() returns bool to indicate if file was written by current process

[JanTvrdik]

• bug fix / new feature? minor low-level feature
• BC break? no
• doc PR: too low-level to be worth documenting

I need to upload the bluescreen to remote storage (AWS S3 in my case). This is what I'm doing currently

$lockPath = "$localPath.lock";
$lockHandle = @fopen($lockPath, 'x');
if ($lockHandle === false) {
	return;
}

Tracy\Debugger::getBlueScreen()->renderToFile($exception, $localPath);
$this->remoteStorageDriver->upload($localPath);

@fclose($lockHandle);
@unlink($lockPath);

The proposed change would allow to simplify to code to

if (Tracy\Debugger::getBlueScreen()->renderToFile($exception, $localPath)) {
	$this->remoteStorageDriver->upload($localPath);
}