GUI: expand previewable attachments upon first click on the attachment icon
The motivation is to make expanding of previewable attachments smooth, but at the same time do not interfere with the way how the button has worked so far too much. When an attachment cannot be previewed, nothing changes and everything works as it used to work before. When a preview can be shown, however, clicking on the icon of the attachment at the time the preview is collapsed will simply show the preview. When the preview is shown, however, clicking any part of the icon will still bring up the menu as it used to work previously. This is an alternative implementation to review #117068. v2: Use another approach for determining what action to take based on the actual state of the preview in order to prevent duplicate connections. Thanks to Thomas Lübking for pointing out a possible problem here. BUG: 332586 REVIEW: 117295
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