format paragraph produce inconsistent wrapping

[onlyjob]

​http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725692

Format paragraph (Alt+P) often produce strange formatting when some lines are considerably shorter than maximum line width. Also it looks like formatting sometimes stop on some characters like '*' even before the end of paragraph so when cursor is positioned just below short line with '*' pressing Alt-P re-format the paragraph down from cursor. This was found in 4.8.10 and 4.8.11. Here is sample text where problem is mildly manifesting (try re-formatting it with word-wrap-line-length=74 and see how some short lines do not change or do not change unless cursor is positioned below problematic line):

ext4* does not yet have as much support as *ext2* and *ext3* on non-Linux
operating systems. *ext2* and *ext3* have stable drivers such as
ext2IFS, which are not yet available for *ext4*. It is possible to 
create compatible *ext4* filesystems for use in Windows by disabling the
extents feature, and sometimes specifying an inode size.[20] Another option
for using *ext4* in Windows is to use ext2Fsd,[21] an open-source driver
that, like ext2IFS, supports writing in *ext4* 
partitions where extents have been disabled. Viewing and copying files from
*ext4* to Windows, even with extents enabled, is also possible
with the ext2Read software.[22] More recently Paragon
released its ExtFS for Windows which allows read/write
capabilities for ext2/3/4.

[onlyjob]

Another sample:

_ALT-P sometimes does not properly wrap the first line of a paragraph - it
ends considerably /*/ shorter than what would have fit
inside the configured maximum width

[andrew_b]

Related to #1666.

[andrew_b]

Branch: 3119_format_paragraph.
Initial changeset:27343cc163b5e39a06790d4cc64251b963d030ce

We have two independent issues here:

1. Short line as in comment:1. This is a bug and it is fixed in this branch (1st commit).
2. Strange formatting as described in ticket. I'm not sure there is a bug. Formatting stops if next line starts with one of the following chars (src/editor/wordproc.c:64):

   #define NO_FORMAT_CHARS_START "-+*\\,.;:&>"
   

I don't know why that was implemented in old time. Since 1998 this behavior presents in mcedit. See ​https://www.midnight-commander.org/browser/edit/wordproc.c?rev=eb6b3842abd84db5e9a7695d59fb6db5c5321f4f.

[andrew_b]

The new editor_stop_format_chars option in ~/.config/mc/ini is used now instead of hardcoded NO_FORMAT_CHARS_START.

[andrew_b]

Merged to master: [bc2f24b0e5b19780a13e8de5ef6bc3b313c23cc5].

git log --pretty=oneline 7c7ed5e..bc2f24b