Initialize override_ascent member.
(append_space_for_newline): Reset override_ascent.
Remove use_default_face.
(calc_line_height_property): New function to calculate value of
line-height and line-spacing properties. Look at overlays, too.
Set override_ascent, override_descent, override_boff members when
using another face than the current face. Float values are now
relative to the frame default font, by default; accept a cons
of ratio and face name to specify value relative to a specific face.
(x_produce_glyphs): Use calc_line_height_property.
Use override_ascent etc. when set to handle different face heights.
A negative line-spacing property value is interpreted as a total
line height, rather than inter-line spacing.
(note_mouse_highlight): Allocate room for 40 overlays initially.
Prepend `src/' to the file name.
(help-C-source-directory, help-subr-name, help-find-C-source): Remove.
(describe-function-1, describe-variable): Only find a C source file name
if DOC is already loaded.
(outline-end-of-subtree): Include last newline into subtree.
(hide-entry): Leave point at beginning of heading instead of end.
(outline-up-heading): Push mark for the first call of successive command calls.
Add new key bindings for isearch-yank-char to \C-f, and isearch-del-char to \C-b.
(isearch-del-char): New fun.
(isearch-forward, isearch-edit-string): Update docstring.
(isearch-yank-char): Doc fix.
(isearch-other-meta-char): Restore point after scrolling.
(ielm-prompt-internal): New variable.
(ielm-font-lock-keywords): Remove irrelevant ielm-prompt keyword.
(ielm-send-input): Delete unused variable `buf'.
(ielm-eval-input): Use `ielm-prompt-internal'.
(inferior-emacs-lisp-mode): Use new variables
`comint-prompt-read-only' and `ielm-prompt-internal'.
Get rid of obsolete variable `directory-sep-char'.
(ielm): Use `zerop'.
(on_hot_spot_p): Make sure we always return a value.
(Flookup_image_map): Remove unused var ix and iy.
(note_mode_line_or_margin_highlight): Remove unused var `image'.
* wid-edit.el (widget-specify-button): Put evaporate to the
overlay for sample.
(widget-specify-sample): Put evaporate to the overlay for sample.
(widget-specify-doc): Put evaporate to the overlay for documentation.
* etc/NEWS: Write about remove-overlays's arguments.
* man/widget.texi: Add remove-overlays to the example.
(browse-url-mozilla-sentinel, browse-url-galeon-sentinel)
(browse-url-epiphany-sentinel, browse-url-mosaic): Use
browse-url-*-program instead of a literal program name.
