The source project of this merge request has been removed.
Fix non-filled writeable icons; fix selection issue
If a writeable icon does not have a filled background, display corruption occurs. Force all writeables to be filled, similar to pre-clipboard Wimp. If there are multiple writeable icons in a window, selecting text in one and then moving caret to another leaves the original selection. This leads to inadvertent user deletion of text in the original selection if (eg) backspace is pressed. Adjust behaviour so that the selection is removed if the caret is transferred to a new icon in the same window.