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-rw-r--r--lisp/mouse.el6
1 files changed, 5 insertions, 1 deletions
diff --git a/lisp/mouse.el b/lisp/mouse.el
index 9a3e2235ece..5c9056fb43d 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -1225,7 +1225,11 @@ The region will be defined with mark and point."
(bounds (window-edges start-window))
(make-cursor-line-fully-visible nil)
(top (nth 1 bounds))
- (bottom (if (window-minibuffer-p start-window)
+ (bottom (if (or (window-minibuffer-p start-window)
+ ;; Do not account for the mode line if there
+ ;; is no mode line, which is common for child
+ ;; frames.
+ (not mode-line-format))
(nth 3 bounds)
;; Don't count the mode line.
(1- (nth 3 bounds))))