Add function that only copies selected text unless the cursor is at the beginning of the line.

src/text-editor-element.coffee

@@ -302,6 +302,7 @@ atom.commands.add 'atom-text-editor', stopEventPropagationAndGroupUndo(
   'editor:transpose': -> @transpose()
   'editor:upper-case': -> @upperCase()
   'editor:lower-case': -> @lowerCase()
+  'editor:copy-selection': -> @copyOnlySelectedText()
 )
 
 atom.commands.add 'atom-text-editor:not([mini])', stopEventPropagation(

src/text-editor.coffee

@@ -2587,6 +2587,18 @@ class TextEditor extends Model
       maintainClipboard = true
     return
 
+
+  # Essential: For each selection, only copy hightlighted text. Line is coptied if no selected text and cursor is at the beginning of the line
+  copyOnlySelectedText: ->
+    maintainClipboard = false
+    for selection in @getSelectionsOrderedByBufferPosition()
+      if not selection.isEmpty()
+        selection.copy(maintainClipboard, true)
+      else if selection.isEmpty() and selection.cursor.isAtBeginningOfLine()
+        @copySelectedText()
+      maintainClipboard = true
+    return
+
   # Essential: For each selection, cut the selected text.
   cutSelectedText: ->
     maintainClipboard = false