bug #50974 and #50379 (textview)

[Mikael Hermansson <mikeh bahnhof se>]

bug #50974 reported by me:

GtkTextView has a bug when there are more text than the visible view area
can show.

The widget does not "scroll to view" when inserting a new line interactive
(pressing <RETURN>) at the end of visible text.

for example if the cursor is at the end of visible textarea and you
pressing return to insert a new line the widget will not update scroll
adjustment and the cursor will be outside the viewarea until you insert a
character at the new line.

This probadly has to do with another bug reported by me (bug #50379)!

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Looks like line height is initially set to 0 if there is no text in the
line is there any reason this is set to 0? IMHO. the line height
should be set to current font height?

Greets

M.H.