BG fixes for COntainer

packages/vitec/Configuration/TCA/Overrides/tt_content_vitec_shared.php

@@ -125,15 +125,16 @@ use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
     foreach (['top', 'bottom', 'left', 'right'] as $edge) {
         $positionOffsets['tx_vitec_bg_pos_' . $edge] = [
             'label' => $l . 'bg_pos.' . $edge,
+            'description' => $l . 'bg_pos.description',
             'displayCond' => 'FIELD:tx_vitec_bg_position:=:custom',
             'config' => [
                 'type' => 'number',
                 'size' => 5,
                 'nullable' => true,
-                'range' => [
-                    'lower' => 0,
-                    'upper' => 100,
-                ],
+                // No range on purpose: background-position accepts values below
+                // 0 and above 100, which is how you push an image partly out of
+                // its container. Capping at 0..100 would forbid exactly the
+                // layouts these free offsets exist for.
             ],
         ];
     }

packages/vitec/Resources/Private/Language/locallang_containers.xlf

@@ -258,6 +258,9 @@
 			<trans-unit id="bg_pos.right" resname="bg_pos.right">
 				<source>Right %</source>
 			</trans-unit>
+			<trans-unit id="bg_pos.description" resname="bg_pos.description">
+				<source>Distance from that edge, in percent. Leave empty to centre on this axis. Values below 0 and above 100 are allowed and push the image beyond the edge. Filling both ends of an axis is contradictory - the near edge wins (left over right, top over bottom).</source>
+			</trans-unit>
 
 		</body>
 	</file>