Not really a Legion bug since it's also on Live, but players can spam battlegrounds/instances with group tags, overcoming the 255 character limit
If it's the group leader, they can also spam /rw
Code:
/rw {g1} {g2} {g3} {g4}
https://github.com/Gethe/wow-ui-sour...ua#L3133-L3148
Lua Code:
elseif ( GROUP_TAG_LIST[term] ) then
local groupIndex = GROUP_TAG_LIST[term];
local groupList = "[";
for i=1, GetNumGroupMembers() do
local name, rank, subgroup, level, class, classFileName = GetRaidRosterInfo(i);
if ( name and subgroup == groupIndex ) then
local classColorTable = RAID_CLASS_COLORS[classFileName];
if ( classColorTable ) then
name = string.format("\124cff%.2x%.2x%.2x%s\124r", classColorTable.r*255, classColorTable.g*255, classColorTable.b*255, name);
end
groupList = groupList..(groupList == "[" and "" or PLAYER_LIST_DELIMITER)..name;
end
end
groupList = groupList.."]";
arg1 = string.gsub(arg1, tag, groupList);
end
--
Source:
http://us.battle.net/wow/en/forum/topic/20745725950