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The driver's clip_ member was not updated to the new Cairo clip state
which rendered function Fl_Cairo_Graphics_Driver::clip_box() inaccurate.
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@wcout reports that we get better results if function pango_font_metrics_get_height()
is not used until version 1.50.6 and above of libpango. The difference is specially visible
with underscore characters in unscaled, standard DPI displays. This commit does that.
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The panel was drawn solid black when test/mandelbrot was unfocussed.
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fl_begin/end_loop/polygon().
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endianness.
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This commit fixes " "drawing an fl_pie() with dimension 1x1".
But it does not change "drawing fl_line() with begin position = end position does not show"
because the same behaviour is observed with Windows and macOS.
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That's because this member is used only in Fl_Quartz_Font_Descriptor.
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scaling applies.
The implemented approach is to create and use the pango_layout_ object only relatively
to an unscaled cairo context. With this, the pixel width of a drawn string equals
the sum of the widths of its characters.
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duplication.
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scales.
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The solution to avoid blurred graphics when the GUI is scaled is to turn off
cairo antialiasing when drawing horizontal and vertical lines and rectangles.
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cairo_surface_destroy().
Add also replacement for pango_font_metrics_get_height() which requires Pango 1.44
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