Text RegionType: Fix size calculation on scaled regions

Somehow in the linked bug report, the aura is attached to an nameplate
with an very small scale factor. This makes the text aura set the region
width to an excessive number, which with the left aligned text looks
like a offset to the left.

Fixes: #5230

WeakAuras/RegionTypes/Text.lua

@@ -161,17 +161,22 @@ local function modify(parent, region, data)
         if text:GetFont() then
           text:SetText(WeakAuras.ReplaceRaidMarkerSymbols(textStr));
         end
-      end
-      local width = text:GetWidth();
-      local height = text:GetStringHeight();
-      if(width ~= region.width or height ~= region.height ) then
-        region.width = width;
-        region.height = height;
-        region:SetWidth(region.width);
-        region:SetHeight(region.height);
-        if(data.parent and Private.regions[data.parent].region.PositionChildren) then
-          Private.regions[data.parent].region:PositionChildren();
+        -- If the text changes we need to figure out the text size
+        -- To unset scaling we need to temporarily detach the text from
+        -- the region
+        text:SetParent(UIParent)
+        local width = text:GetWidth();
+        local height = text:GetStringHeight();
+        if(width ~= region.width or height ~= region.height ) then
+          region.width = width
+          region.height = height
+          region:SetWidth(region.width);
+          region:SetHeight(region.height);
+          if(data.parent and Private.regions[data.parent].region.PositionChildren) then
+            Private.regions[data.parent].region:PositionChildren();
+          end
         end
+        text:SetParent(region)
       end
     end
   end