File format change. On format reversion, we need to put some extra code
in the local layout that emulates the 2.3 behavior.
Simply Input'ing the respective layouts is unfortunately not enough,
due to the insertion order.
See #9977
"lyxclient -g" now calls the just implemented lyx-activate (see
previous commit) after server-goto-file-row. This allows the PDF
viewer to switch to LyX after executing a reverse search.
On Linux and Mac OS, this action brings the LyX window into focus.
Such behavior is not allowed by Windows OS so instead the color of
the taskbar entry is changed to indicate that the window has changed
in some way.
The action is hidden in the shortcuts menu because it would make
sense to assign a shortcut to it. The only way to execute shortcut
would be if the LyX window is already activated.
lyx-activate will be used (see next commit) to allow the PDF viewer
to switch to LyX after executing a reverse search.
* New constant LYXFILE_LAYOUT_FORMAT in src/TextClass.cpp. This determines the
layout format corresponding to the current lyx file format.
* The Local Layout pane is changed so that the "Convert" button does not convert
to the internal layout format but to the current lyx file format, to make sure
that the file does not become unreadable with a specified earlier version of
LyX.
* If LYXFILE_LAYOUT_FORMAT == LAYOUT_FORMAT then LyX behaves as before. This is
the value defined in master.
It is currently called on hundreds of files: settings, layouts, icons, cached
graphics files (incl. graphics from files that are not opened on startup).
According to callgrind, fixing the FIXME comments could speed up startup by more
than 30%.
A static local variable is guaranteed to be initialized only once, and in time.
Lambda expressions can be used to perform complex initialization of those static
variables on the spot.
(starting from: gcc >= 4.8, msvc >= 2015)
Prevent setRange() from causing a recursive call to scrollTo(). Reduces three
calls of scrollTo() to one call for all scrolling functions of the scroll bar
(e.g. clicking on the arrow, dragging, or clicking somewhere on the scrollbar).
