InputDialog: add param to setInputText() to set cursor pos

When not provided, the cursor stays at its initial position,
which might not be the best if replacing the whole content,
where we would prefer to have it at start or end.

frontend/ui/widget/inputdialog.lua

@@ -500,11 +500,18 @@ function InputDialog:getInputValue()
     end
 end
 
-function InputDialog:setInputText(text, edited_state)
+function InputDialog:setInputText(text, edited_state, cursor_at_start_or_end)
     self._input_widget:setText(text)
     if edited_state ~= nil and self._buttons_edit_callback then
         self._buttons_edit_callback(edited_state)
     end
+    if cursor_at_start_or_end ~= nil then -- true=start, false=end
+        if cursor_at_start_or_end then
+            self._input_widget:scrollToTop()
+        else
+            self._input_widget:scrollToBottom()
+        end
+    end
 end
 
 function InputDialog:isTextEditable()