- fixes german umlauts

GricheldeChat.lua

@@ -206,6 +206,15 @@ function Grichelde:ReplaceCharacters(text, replName, replTable, consolidate, rep
                     p, patRest = getNextCharUtf8(patRest)
                 end
                 ciPattern = ciPattern .. "]"
+            elseif (isUtf8MultiByte(p)) then
+                -- a set like [Ää] would match single bytes, so only group the differing last byte
+                local upperP, lowerP = toUpper(p), toLower(p)
+                local lead = sub(p, 1, -2)
+                if (upperP ~= lowerP) and (sub(upperP, 1, -2) == lead) and (sub(lowerP, 1, -2) == lead) then
+                    ciPattern = ciPattern .. lead .. "[" .. sub(upperP, -1) .. sub(lowerP, -1) .. "]"
+                else
+                    ciPattern = ciPattern .. p
+                end
             else
                 ciPattern = ciPattern .. "[" .. convertToCaseInsensitivePatternGroup(p) .. "]"
             end
@@ -428,8 +437,9 @@ function Grichelde:ReplaceCharacters(text, replName, replTable, consolidate, rep
             end
 
             -- update previous consolidate markers
-            local diff = lengthUtf8(replText) - lengthUtf8(match)
-            self:TracePrint("ReplaceCharacters : diff = %d - %d", lengthUtf8(replText), lengthUtf8(match))
+            -- positions are byte offsets, so the difference must be counted in bytes as well
+            local diff = length(replText) - length(match)
+            self:TracePrint("ReplaceCharacters : diff = %d - %d", length(replText), length(match))
             for key, posList in pairs(consolidate) do
                 if (key ~= replName) then
                     for i, pc in ipairs(posList) do