Shift-triple-click expands the selection over the clicked line

src/app/cursor.coffee

@@ -126,6 +126,9 @@ class Cursor extends View
   getCurrentWordBufferRange: ->
     new Range(@getBeginningOfCurrentWordBufferPosition(allowPrevious: false), @getEndOfCurrentWordBufferPosition(allowNext: false))
 
+  getCurrentLineBufferRange: ->
+    @editor.rangeForBufferRow(@getBufferPosition().row)
+
   moveToEndOfLine: ->
     { row } = @getBufferPosition()
     @setBufferPosition({ row, column: @editor.buffer.lineForRow(row).length })

src/app/editor.coffee

@@ -145,7 +145,10 @@ class Editor extends View
         else
           @compositeSelection.getLastSelection().selectWord()
       else if clickCount >= 3
-        @compositeSelection.getLastSelection().selectLine()
+        if e.shiftKey
+          @compositeSelection.getLastSelection().expandOverLine()
+        else
+          @compositeSelection.getLastSelection().selectLine()
 
       @selectOnMousemoveUntilMouseup()
 

src/app/selection.coffee

@@ -166,8 +166,10 @@ class Selection extends View
     @setBufferRange(@getBufferRange().union(@cursor.getCurrentWordBufferRange()))
 
   selectLine: (row=@cursor.getBufferPosition().row) ->
-    rowLength = @editor.buffer.lineForRow(row).length
-    @setBufferRange new Range([row, 0], [row, rowLength])
+    @setBufferRange(@editor.rangeForBufferRow(row))
+
+  expandOverLine: ->
+    @setBufferRange(@getBufferRange().union(@cursor.getCurrentLineBufferRange()))
 
   selectToScreenPosition: (position) ->
     @modifySelection => @cursor.setScreenPosition(position)