manual: Add FAQ entry about copying text from popup

Closes #126.

2 files changed, 30 insertions, 0 deletions

diff --git a/docs/transient.org b/docs/transient.org
index 227dc29..4947f2a 100644
--- a/docs/transient.org
+++ b/docs/transient.org
@@ -2228,6 +2228,22 @@ commands are outlined:
 
 Yes, see ~transient-display-buffer-action~ in [[*Configuration]].
 
+** How can I copy text from the popup buffer?
+:PROPERTIES:
+:UNNUMBERED: notoc
+:END:
+
+To be able to mark text in any transient popup buffer using the mouse,
+you have to add the following binding.  Note that the region won't be
+visualized, while doing so.  After you have quit the transient popup,
+you will be able to yank it another buffer.
+
+#+begin_src emacs-lisp
+  (keymap-set transient-predicate-map
+              "<mouse-set-region>"
+              #'transient--do-stay)
+#+end_src
+
 ** Why did some of the key bindings change?
 :PROPERTIES:
 :UNNUMBERED: notoc
diff --git a/docs/transient.texi b/docs/transient.texi
index bc72121..ed1a535 100644
--- a/docs/transient.texi
+++ b/docs/transient.texi
@@ -2557,6 +2557,20 @@ currently exist.
 
 Yes, see @code{transient-display-buffer-action} in @ref{Configuration}.
 
+@anchor{How can I copy text from the popup buffer?}
+@appendixsec How can I copy text from the popup buffer?
+
+To be able to mark text in any transient popup buffer using the mouse,
+you have to add the following binding.  Note that the region won't be
+visualized, while doing so.  After you have quit the transient popup,
+you will be able to yank it another buffer.
+
+@lisp
+(keymap-set transient-predicate-map
+            "<mouse-set-region>"
+            #'transient--do-stay)
+@end lisp
+
 @anchor{Why did some of the key bindings change?}
 @appendixsec Why did some of the key bindings change?