improved tooltip wrapping a bit, basing it on the actual width of the rendered width (using the font renderer), and force wrapping long 'words', which allows actually wrapping Chinese text, e.g.

src/main/java/li/cil/oc/util/Tooltip.scala

@@ -1,16 +1,20 @@
 package li.cil.oc.util
 
 import li.cil.oc.Settings
+import net.minecraft.client.Minecraft
 import net.minecraft.util.StatCollector
 import org.lwjgl.input.Keyboard
 import scala.collection.convert.WrapAsJava._
 import scala.collection.mutable
 
 object Tooltip {
+  val maxWidth = 200
+
   def get(name: String, args: Any*): java.util.List[String] = {
     val tooltip = StatCollector.translateToLocal(Settings.namespace + "tooltip." + name).format(args.map(_.toString): _*)
     val isSubTooltip = name.contains(".")
-    val shouldShorten = (isSubTooltip || tooltip.length > 50) &&
+    val font = Minecraft.getMinecraft.fontRenderer
+    val shouldShorten = (isSubTooltip || font.getStringWidth(tooltip) > maxWidth) &&
       !Keyboard.isKeyDown(Keyboard.KEY_LSHIFT) &&
       !Keyboard.isKeyDown(Keyboard.KEY_RSHIFT)
     if (shouldShorten) {
@@ -22,23 +26,39 @@ object Tooltip {
       val lines = mutable.ArrayBuffer.empty[String]
       tooltip.split(nl).foreach(line => {
         val formatted = line.trim.stripLineEnd
+        var position = 0
         var start = 0
-        var end = 0
-        var count = 0
-        var formats = 0
-        for (c <- formatted.trim) {
+        var lineEnd = 0
+        var width = 0
+        var lineWidth = 0
+        val iterator = formatted.iterator
+        while (iterator.hasNext) {
+          val c = iterator.next()
           if (c == '§') {
-            formats += 1
+            iterator.next()
           }
-          else if (c == ' ') {
-            end = count
-          }
-          count += 1
-          if (count - formats > 45 && end > 0) {
-            lines += formatted.substring(start, start + end)
-            count -= end + 1
-            start += end + 1
-            end = 0
+          else {
+            if (c == ' ') {
+              lineEnd = position
+              lineWidth = width
+            }
+            else {
+              width += font.getCharWidth(c)
+            }
+            position += 1
+            if (width > maxWidth) {
+              if (lineEnd > start) {
+                lines += formatted.substring(start, lineEnd)
+                start = lineEnd + 1
+                width -= lineWidth
+                lineWidth = 0
+              }
+              else {
+                lines += formatted.substring(start, position)
+                start = position
+                width = 0
+              }
+            }
           }
         }
         if (start < formatted.length) {