fdo#47907: fix flickering scrolling in Basic IDE

[János Uray]

This patch solves this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=47907

The text was flickering because Window::Invalidate() clears the client area
by default. To prevent this, I've added an INVALIDATE_NOERASE parameter to
Invalidate() calls.
On the other hand, the background still needed to be erased outside the
text: the indentation space and the rest of the line.

(Note: both svtools and basctl must be rebuilt.)

Regards,
Uray M. János
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