[PATCH] cairolatex: respect transparency setting

[Henri M. <hen...@gm...>]

Currently the cairolatex terminal does not respect transparency options
given in the terminal setting.  In this minimal example the
notransparent option is ignored:

    set terminal cairolatex png notransparent
    set output "test.tex"
    plot sin(x)

Running this through gnuplot and then using `file' reveals that the
alpha channel is still present:

    $ gnuplot test.gnuplot && file test.png
    test.png: PNG image data, 1500 x 900, 8-bit/color RGBA, non-interlace

With this patch the transparency setting will be honoured.  The current
default setting of implicitly assuming transparency is unaltered.
---
 term/cairo.trm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/term/cairo.trm b/term/cairo.trm
index ee748dfe2..3ef76ecc6 100644
--- a/term/cairo.trm
+++ b/term/cairo.trm
@@ -849,7 +849,7 @@ void cairotrm_graphics()
 	plot.background.g = cairo_params->background.g;
 	plot.background.b = cairo_params->background.b;
 	gp_cairo_set_background(cairo_params->background);
-	if (ISCAIROLATEX || cairo_params->transparent)
+	if (cairo_params->transparent)
 		gp_cairo_clear_background(&plot);
 	else
 		gp_cairo_solid_background(&plot);
-- 
2.28.0