- All internal source files (except "examples", which are not internal)
should include "config.h" first. As also all internal source
files should include "nm-default.h", let "config.h" be included
by "nm-default.h" and include "nm-default.h" as first in every
source file.
We already wanted to include "nm-default.h" before other headers
because it might contains some fixes (like "nm-glib.h" compatibility)
that is required first.
- After including "nm-default.h", we optinally allow for including the
corresponding header file for the source file at hand. The idea
is to ensure that each header file is self contained.
- Don't include "config.h" or "nm-default.h" in any header file
(except "nm-sd-adapt.h"). Public headers anyway must not include
these headers, and internal headers are never included after
"nm-default.h", as of the first previous point.
- Include all internal headers with quotes instead of angle brackets.
In practice it doesn't matter, because in our public headers we must
include other headers with angle brackets. As we use our public
headers also to compile our interal source files, effectively the
result must be the same. Still do it for consistency.
- Except for <config.h> itself. Include it with angle brackets as suggested by
https://www.gnu.org/software/autoconf/manual/autoconf.html#Configuration-Headers
If an NmtEditorGrid row has a widget, but no label, then we make the
widget span both the label and widget columns. But previously we
weren't doing the same for rows with labels but no widgets. (In fact,
we didn't even allow rows with no widgets; label-only rows had to
specify dummy widgets.)
Fix it so that labels will span into an empty widget column. (This
ensures that a long section name won't force the entire grid to have
an overwide label column).
Also, in both the "no label" and "no widget" cases, still show the
"extra" column if it's present.
Rename NmtPageDevice to NmtEditorPageDevice, and rename NmtPageGrid to
NmtEditorGrid.
Now all types with names starting with "NmtPage" are instantiable page
types, not abstract classes or low-level widgets.
