add composing mobile classes if composing on mobile

public/src/modules/composer.js

@@ -256,7 +256,7 @@ define('composer', [
 		composer.bsEnvironment = utils.findBootstrapEnvironment();
 
 		var data = {
-			mobile: template === (composer.bsEnvironment === 'xs' || composer.bsEnvironment === 'sm'),
+			mobile: composer.bsEnvironment === 'xs' || composer.bsEnvironment === 'sm',
 			allowTopicsThumbnail: allowTopicsThumbnail,
 			showTags: isTopic || isMain,
 			minimumTagLength: config.minimumTagLength,

public/src/modules/composer/resize.js

@@ -34,8 +34,7 @@ define('composer/resize', function() {
 		// todo, lump in browsers that don't support transform (ie8) here
 		// at this point we should use modernizr
 		if (env === 'sm' || env === 'xs' || window.innerHeight < 480) {
-			app.toggleNavbar(false);
+			$('html').addClass('composing mobile');
-			postContainer.find('textarea').css('height', $(window).height());
 		}
 
 		if (config.hasImageUploadPlugin) {