erp5_document_scanner: generate selection name based on HTTP Agent

bt5/erp5_document_scanner/SkinTemplateItem/portal_skins/erp5_document_scanner/Base_getDocumentScannerSelectionName.py

-return "document_scanner_selection"
+return "document_scanner_selection_%s" % context.REQUEST["HTTP_USER_AGENT"]

bt5/erp5_document_scanner/SkinTemplateItem/portal_skins/erp5_document_scanner/Base_getDocumentScannerSelectionName.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string></string> </value>
+            <value> <string>REQUEST</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>

bt5/erp5_document_scanner/SkinTemplateItem/portal_skins/erp5_document_scanner/Base_getPreferredCropperSettingsFromPreference.py

@@ -3,7 +3,7 @@ import json
 portal = context.getPortalObject()
 
 canvas_data = portal.portal_selections.getSelectionParamsFor(
-  context.Base_getDocumentScannerSelectionName(),
+  context.Base_getDocumentScannerSelectionName(context.REQUEST),
   REQUEST=context.REQUEST) or {}
 
 canvas_data["dialog_method"] = context.Base_storeDocumentFromCameraInActiveProcess.getId()

bt5/erp5_document_scanner/SkinTemplateItem/portal_skins/erp5_document_scanner/Base_storeDocumentFromCameraInActiveProcess.py

@@ -9,7 +9,7 @@ image_str = decodestring(gadget_data.pop("input_value"))
 preferred_cropped_canvas_data = gadget_data["preferred_cropped_canvas_data"] or {}
 
 portal.portal_selections.setSelectionParamsFor(
-  context.Base_getDocumentScannerSelectionName(),
+  context.Base_getDocumentScannerSelectionName(context.REQUEST),
   preferred_cropped_canvas_data,
   context.REQUEST
 )