Make bounding box of 'image-crop' more noticeable

* lisp/image/image-crop.el (image-crop--crop-image-1): Darken the
selected region to make the bounding-box more noticable in images
which are mostly white (bug#58004).

diff --git a/lisp/image/image-crop.el b/lisp/image/image-crop.el
index 61ed7e1db1794ff619e94b85d1117b7fc6ddb36d..7fbbf85f9392145c63819ac6b23fff26cf4e0720 100644 (file)
--- a/lisp/image/image-crop.el
+++ b/lisp/image/image-crop.el
@@ -357,18 +357,10 @@ After cropping an image, you can save it by `M-x image-save' or
                ((memq (car event) '(mouse-1 drag-mouse-1))
                 (setq state 'move-unclick
                        prompt (format "Click to move for %s" op)))))))))
-     do (svg-line svg (cl-getf area :left) (cl-getf area :top)
-                 (cl-getf area :right) (cl-getf area :top)
-                 :id "top-line" :stroke-color "white")
-     (svg-line svg (cl-getf area :left) (cl-getf area :bottom)
-              (cl-getf area :right) (cl-getf area :bottom)
-              :id "bottom-line" :stroke-color "white")
-     (svg-line svg (cl-getf area :left) (cl-getf area :top)
-              (cl-getf area :left) (cl-getf area :bottom)
-              :id "left-line" :stroke-color "white")
-     (svg-line svg (cl-getf area :right) (cl-getf area :top)
-              (cl-getf area :right) (cl-getf area :bottom)
-              :id "right-line" :stroke-color "white")
+     do (svg-rectangle svg (cl-getf area :left) (cl-getf area :top)
+                       (image-crop--width area) (image-crop--height area)
+                       :stroke-color "red" :stroke-width 2
+                       :fill-opacity 0.3 :fill "black" :id "rect")
      while (not (member event '(return ?q)))
      finally (return (and (eq event 'return)
                          area)))))