Buffer changes updates a stable list of folds

src/app/renderer.coffee

@@ -127,9 +127,9 @@ class Renderer
     @lineMap.clipScreenPosition(position, options)
 
   handleBufferChange: (e) ->
-    for row, folds of @activeFolds
-      for fold in new Array(folds...)
-        fold.handleBufferChange(e)
+    allFolds = [] # Folds can modify @activeFolds, so first make sure we have a stable array of folds
+    allFolds.push(folds...) for row, folds of @activeFolds
+    fold.handleBufferChange(e) for fold in allFolds
 
     @handleHighlighterChange(@lastHighlighterChangeEvent)
 

src/app/selection.coffee

@@ -145,6 +145,7 @@ class Selection extends View
     @editor.getCurrentMode().autoOutdent(state, new AceOutdentAdaptor(@editor.buffer, @editor), bufferRow)
 
   backspace: ->
+    @editor.destroyFoldsContainingBufferRow(@getBufferRange().end.row)
     @selectLeft() if @isEmpty()
     @deleteSelectedText()