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gtk-builder-tool: Error out if screenshooting fails
If we don't produce a texture for whatever reason, apologize and fail.
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@ -256,6 +256,12 @@ screenshot_file (const char *filename,
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g_object_unref (builder);
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if (texture == NULL)
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{
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g_printerr ("Failed to take a screenshot\n");
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exit (1);
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}
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save_to = (char *)save_file;
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if (save_to == NULL)
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