Added missing middleware to trim input

app/Http/Kernel.php

@@ -13,8 +13,9 @@ class Kernel extends HttpKernel
      */
     protected $middleware = [
         \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
-        \Illuminate\Session\Middleware\StartSession::class,
+        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
-        \Illuminate\View\Middleware\ShareErrorsFromSession::class,
+        \BookStack\Http\Middleware\TrimStrings::class,
+        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
     ];
 
     /**
@@ -26,6 +27,8 @@ class Kernel extends HttpKernel
         'web' => [
             \BookStack\Http\Middleware\EncryptCookies::class,
             \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
+            \Illuminate\Session\Middleware\StartSession::class,
+            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \BookStack\Http\Middleware\VerifyCsrfToken::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
             \BookStack\Http\Middleware\Localization::class

app/Http/Middleware/TrimStrings.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace BookStack\Http\Middleware;
+
+use Illuminate\Foundation\Http\Middleware\TrimStrings as BaseTrimmer;
+
+class TrimStrings extends BaseTrimmer
+{
+    /**
+     * The names of the attributes that should not be trimmed.
+     *
+     * @var array
+     */
+    protected $except = [
+        'password',
+        'password_confirmation',
+    ];
+}