Always pull line text from buffer

This accounts for positional changes that may occur if the marker
the operation is tracking moves.

src/app/project.coffee

@@ -178,7 +178,7 @@ class Project
       for [column, length] in matchPositions
         range = new Range([row, column], [row, column + length])
         match = lineText.substr(column, length)
-        iterator({path, range, match, lineText})
+        iterator({path, range, match})
 
     deferred = $.Deferred()
     exit = (code) ->

src/packages/command-panel/lib/commands/select-all-matches-in-project.coffee

@@ -13,12 +13,11 @@ class SelectAllMatchesInProject extends Command
   compile: (project, buffer, range) ->
     deferred = $.Deferred()
     operations = []
-    promise = project.scan @regex, ({path, range, match, lineText}) ->
+    promise = project.scan @regex, ({path, range}) ->
       operations.push(new Operation(
         project: project
         path: path
         bufferRange: range
-        lineText: lineText
       ))
 
     promise.done -> deferred.resolve(operations)

src/packages/command-panel/lib/operation.coffee

@@ -1,6 +1,6 @@
 module.exports =
 class Operation
-  constructor: ({@project, @path, @buffer, @bufferRange, @lineText, @newText, @preserveSelection, @errorMessage}) ->
+  constructor: ({@project, @path, @buffer, @bufferRange, @newText, @preserveSelection, @errorMessage}) ->
     if @buffer?
       @buffer.retain()
       @getMarker()
@@ -24,9 +24,10 @@ class Operation
 
   preview: ->
     range = @getBufferRange()
-    prefix = @lineText[0...range.start.column]
-    match = @lineText[range.start.column...range.end.column]
-    suffix = @lineText[range.end.column..]
+    line = @getBuffer().lineForRow(range.start.row)
+    prefix = line[0...range.start.column]
+    match = line[range.start.column...range.end.column]
+    suffix = line[range.end.column..]
 
     {prefix, suffix, match, range}