Configurable size for text file preview (655804)

The attachment preview which is shown when hovering the name of an attachment in the Web Client has been adapted to avoid performance problems when rendering the preview for large text files. It is now possible to define a maximum file size for the preview. The preview will not be shown for text files which exceed this limit. The limit is defined in the new page customization attribute textAttachmentsPreviewThreshold of the type cmApplicationCustomization. The default value is 5, so that the preview is only available for text files with less than 5 MB.

There is no size limit for images and PDF files because they do not cause any performance problems.