erp5_document_scanner: Fix issue when clicking you in the main image

When you access an image (after clicking on a thumbnail) and then click on the main image field (cropper area), you get an "Error : Unhandled button".

bt5/erp5_document_scanner/PathTemplateItem/web_page_module/rjs_gadget_document_scanner_js.js

@@ -587,19 +587,21 @@
 
     .onEvent("click", function (evt) {
       // Only handle click on BUTTON and IMG element
-      if (evt.target.tagName !== 'BUTTON' && evt.target.tagName !== 'IMG') {
-        return;
-      }
-
       var gadget = this,
+        tag_name = evt.target.tagName,
         state_dict;
 
+      if (tag_name !== 'BUTTON' &&
+          (tag_name !== 'IMG' || evt.target.className.indexOf("show-img") === -1)) {
+        return;
+      }
+
       // Disable any button. It must be managed by this gadget
       evt.preventDefault();
       // If user clicks on same image twice,
       // we don't need to disable everything again if parent is already disabled
-      if (evt.target.tagName === 'BUTTON' || (
-            evt.target.tagName === 'IMG' && !evt.target.parentElement.disabled)) {
+      if (tag_name === 'BUTTON' || (
+            tag_name === 'IMG' && !evt.target.parentElement.disabled)) {
         gadget.element.querySelectorAll('button').forEach(function (elt) {
           elt.disabled = true;
         });

bt5/erp5_document_scanner/PathTemplateItem/web_page_module/rjs_gadget_document_scanner_js.xml

@@ -244,7 +244,7 @@
                   </item>
                   <item>
                       <key> <string>serial</string> </key>
-                      <value> <string>981.64220.2230.18329</string> </value>
+                      <value> <string>981.65259.1875.5819</string> </value>
                   </item>
                   <item>
                       <key> <string>state</string> </key>
@@ -262,7 +262,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1582242994.7</float>
+                              <float>1582305668.63</float>
                               <string>UTC</string>
                             </tuple>
                           </state>