darktable

I created a blank watermark and added it to the watermarks directory. I created a style, watermark-blank, to apply it. In darkroom I applied a watermark, then applied the style watermark-blank which got rid of the watermark by applying the blank watermark.

I watermarked a file in darkroom, then I went to lighttable and opened the export module. I specified the watermark-blank style as the style and append to history. I exported the file and the watermark was still present.

I went back to darkroom and turned the watermark off. I went to lighttable and created a style, watermark-off, from the image. I turned the watermark back on, then tried exporting the image using the style watermark-off. The watermark was still present on the exported image.

I discovered this in 2.6.0rc1. I went back to 2.4.4 and it's present there also.