; Merge from origin/emacs-25

The following commits were skipped:

7cb120e Improve the doc string of 'format'
3a9866e Improve doc strings in whitespace.el
2e2469b Improve detectability of 'next-logical-line' and 'previous-lo...
16e6207 Fix (next-frame nil t) crash (Bug#24281)
3f539c0 Fix debugging of string-match-p errors
f746a92 Fix region display while dragging mouse
df4f812 Fix 'vertical-motion' and 'posn-at-point' under 'visual-line-...
9135bd7 Improve display of tex-verbatim and Info quoted
e0dd65c Document how to check for ImageMagick support
dc1e0ac Run find-function-after-hook after finding a symbol