Formatting options on right-click

[vanillajonathan]

If I write a word then I select that word, then I right-click to bring up the context menu, it would be convenient if the context menu had entries for bold, italic, strikethrough and such.

[toolstack]

It looks like it should be possible using the populate_popup signal, but a quick attempt isn't working at the moment.

Will add to the future release enhancements list.