Otherwise it will be recognized only by the file extension, because
libmagic returns "application/octet-stream" as mime type. Moreover,
if the emf encapsulates a binary image format, it can be confused
with this other format and its preview on screen fails.
In such filesystems, including either Magic.h or magic.h does not
make any difference and the one or other file is included depending
on the search order. In this case, Magic.h was trying to include
itself instead of including magic.h.
This makes the code much easier to read and, additionally, allows to
parse the magic file with magic_load() only once per session.
As a result, getFormatFromFile is slightly faster.
This is not perfect, since variable width columns will break at a certain
treshold, but it is better than what we have now (no tabular width
indication at all)
This effectively enables linebreaks, multipars and layout changes in
non-fixed width (i.e., standard) table columns.
Fixes: #6577
TODO: metrics are wrong (too wide) on screen with linebreaks.
When a raster image with an advertised pixel density different
from 72 dpi is included in a latex file, the output image dimensions
are scaled by the ratio 72/pixel_density. Hence, if a clipping
bounding box is specified, it has to be scaled by the same ratio,
otherwise the images will be clipped differently on screen and output.
Here we use the extractbb command (present in any TeX distribution)
to ask about the output dimensions of the image as dictated by the
pixel density and compute the scaling ratio by the knowledge of the
actual dimensions. If, for whatever reason, extractbb is not found,
everything goes as before, because the clipping bounding box will
simply not be corrected.
According to this page:
http://doc.qt.io/qt-5/cmake-manual.html
the way to replace use of qt5_use_modules() for module "_mod" and target "_target"
is to use
1.) cmake_minimum_required(VERSION 3.1.0)
2.) find_package(Qt5${_mod} CONFIG REQUIRED)
3.) target_link_libraries(${_target} Qt5::${_mod})
The last one sets all reguired libraries, compile flags and needed includes for the ${_target}
Completion uses a complicated async scheme based on timers to update
itself. This is probably not necessary anymore and is fragile to
event order changes.
This is what happens with the new painting scheme. Therefore the
asyncHideXXX() methods have to be made more robust and detect whether
completion state has changed by the time they are triggered.
When an image has to be loaded a second time and the cache
is not used or the image is not in the cache, its preview is
going to be regenerated again. Hence, if the same image
appears more than once on screen, avoid requesting simultaneous
generation of the same preview.
See also this thread:
https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg205057.html
