Robin Gareus 2abf9c66a4 Fix size-request that rely on Pango::Layout ...

A Pango::Layout created by Gtk::Widget::get_pango_context ()
does not have any font set. The Font is inherited from the
layout's context.

The actual font is set when the layout is used in
on_expose_event() via get_window ()->create_cairo_context ().

In some cases we rely on the font-size to calculate the widget's
size before rendering. At this point in time there is no drawing
context from which to inherit the style.

Furthermore, even after a call to `ensure_style()` in the c'tor
of a Widget get_font() simply returns the default value.

All Widgets that rely an Pango::Layout font size during
size-requests have to explicitly set the font.

This fixes various overlarge buttons with the initial default layout.

2021-01-30 02:23:35 +01:00

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