Avoid hangs when opening minified files

* Force soft wraps for lines that exceed 500 chars
* Don't pass more than 500 chars to first-mate

src/text-editor.coffee

@@ -16,6 +16,7 @@ TextEditorElement = require './text-editor-element'
 {isDoubleWidthCharacter, isHalfWidthCharacter, isKoreanCharacter, isWrapBoundary} = require './text-utils'
 
 ZERO_WIDTH_NBSP = '\ufeff'
+MAX_SCREEN_LINE_LENGTH = 500
 
 # Essential: This class represents all essential editing state for a single
 # {TextBuffer}, including cursor and selection positions, folds, and soft wraps.
@@ -2964,7 +2965,7 @@ class TextEditor extends Model
       else
         @getEditorWidthInChars()
     else
-      Infinity
+      MAX_SCREEN_LINE_LENGTH
 
   ###
   Section: Indentation

src/tokenized-buffer.coffee

@@ -8,6 +8,8 @@ ScopeDescriptor = require './scope-descriptor'
 TokenizedBufferIterator = require './tokenized-buffer-iterator'
 NullGrammar = require './null-grammar'
 
+MAX_LINE_LENGTH_TO_TOKENIZE = 500
+
 module.exports =
 class TokenizedBuffer extends Model
   grammar: null
@@ -251,6 +253,8 @@ class TokenizedBuffer extends Model
 
   buildTokenizedLineForRowWithText: (row, text, ruleStack = @stackForRow(row - 1), openScopes = @openScopesForRow(row)) ->
     lineEnding = @buffer.lineEndingForRow(row)
+    if text.length > MAX_LINE_LENGTH_TO_TOKENIZE
+      text = text.slice(0, MAX_LINE_LENGTH_TO_TOKENIZE)
     {tags, ruleStack} = @grammar.tokenizeLine(text, ruleStack, row is 0, false)
     new TokenizedLine({openScopes, text, tags, ruleStack, lineEnding, @tokenIterator})