texthandle: Fix Y positioning of text handles
texthandle: Fix Y positioning of text handles

It is assumed that border.top is the same than pointing_to.height (which
equals the strong cursor position), which is not since some time ago.

The border calculation has been move on top too, it is now used in the
Y position one, and doesn't depend on anything we calculate later.

grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,alexlarsson/gtk,alexlarsson/gtk,alexlarsson/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita