* lisp/mouse.el (mouse-double-click-time): New function to always
return a number for `double-click-time'.
* lisp/emulation/viper-mous.el (viper-multiclick-timeout):
* lisp/foldout.el (foldout-mouse-swallow-events):
* lisp/help.el (help--read-key-sequence):
* lisp/org/org-mouse.el (org-mouse-show-context-menu): Use
'mouse-double-click-time' instead of 'double-click-time'.
* src/keyboard.c (syms_of_keyboard): Mention
'mouse-double-click-time' in doc string of 'double-click-time'.
* test/lisp/mouse-tests.el (mouse-test-mouse-double-click-time):
New test.

In some cases, context menu items are added before the overall prompt
string.  This could cause multiple consecutive separators to appear if
they "surround" the prompt string.  (Bug#52293)

* lisp/mouse.el (context-menu-map): Improve the de-duplication logic
to ignore non-menu-items when checking for consecutive separators.

* test/lisp/mouse-tests.el
(context-menu-map-remove-consecutive-separators)
(context-menu-map-remove-separators-at-beginning-or-end): New tests.

Run "TZ=UTC0 admin/update-copyright".

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

2fcf2df Fix copyright years by hand
26bed8b Update copyright year to 2019
2814292 Fix value of default frame height.  (Bug#33921)

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.

* test/lisp/mouse-tests.el (bug23288-use-return-value)
(bug23288-translate-to-mouse-2): Don't rely as much on details of the
implementation, so it also works with the new code.

Run admin/update-copyright.