2 hours ago
(This post was last modified: 2 hours ago by makeitwork101.)
Thank you, CmykStudent_. And yes, with rich2005's help, I found the correct checkbox. You on the other hand are the first to suggest that once checked, GIMP will remember my choice. So I just tried thresholding a new image, then using the bucket tool to add color, and can confirm that at first it appeared as though my preference was remembered.
However, although I was able to use the bucket tool to fill a space with color once, when I tried using the same tool to fill a different space on the same layer, the color I added to the fist space disappeared. And the same thing happened with each click, i.e., every time I clicked on a space to add color, yes, color was added to that space, but for some inexplicable reason it disappeared from the space that was previously filled, and it wasn't until I again checked "Merge all active filters down" that I was able to use the bucket tool (properly) in order to fill multiple spaces.
Which again raises the question, how do I turn this unwanted feature off permanently?
However, although I was able to use the bucket tool to fill a space with color once, when I tried using the same tool to fill a different space on the same layer, the color I added to the fist space disappeared. And the same thing happened with each click, i.e., every time I clicked on a space to add color, yes, color was added to that space, but for some inexplicable reason it disappeared from the space that was previously filled, and it wasn't until I again checked "Merge all active filters down" that I was able to use the bucket tool (properly) in order to fill multiple spaces.
Which again raises the question, how do I turn this unwanted feature off permanently?

