This allows a single keypress or menu click to repeatedly export a subpage
over the same .t42 file, like "Save" does for TTI files. If further teletext
page formats are added in the future this option should remember which
format was exported.
This option is deliberately different from "Save" as .t42 files are only
exported as the current subpage on view, and some metadata stored in TTI
files but not in .t42 files could be lost.
When exporting .t42 files the document is only marked as cleanly saved if it
consisted of a single subpage. Documents of more than one subpage will still
cause a confirmation dialog to be shown if unsaved, as the other subpages
will be lost unless the document is saved again as TTI.
When the clipboard has plain text data copied from a plain text or ASCII
text editor, pasting the text will perform word wrapping.
The text will originate from the cursor position and subsequent lines will
by default start from column 1 to provide room for alphanumeric colour
control codes in column 0.
If the cursor is at column 0 then all lines will start at column 0.
If a box selection is dragged before pasting the text will originate at
the top left of the selection box and be confined to the box. This can be
used if the second and subsequent lines need to start at a different
column, or if the pasted text must not overwrite an existing feature at
the right side of the page.
Note that cutting or copying text from within QTeletextMaker itself will
not be word wrapped on paste.
decode.* will solely decode the teletext packets into a grid of characters and
colours and other attributes stored in an agnostic way, then render.* will read
this grid and render the characters onto the screen with the Qt specific
methods.
The "insert before" and "insert after" buttons will drop a menu to
select the new triplet mode, allowing triplets with different modes to
be inserted with one less mouse click.
The "insert copy" button still does the old behaviour of inserting a
copy of the currently selected triplet.
