Don't set an explicit line height on mini editors

This allows the line height to be styled via CSS. I would actually
like to allow all these properties to be assigned via CSS rather than
explicitly via the settings view, but that can be deferred until the
old editor is removed.

spec/editor-component-spec.coffee

@@ -2016,6 +2016,9 @@ describe "EditorComponent", ->
       component.setShowInvisibles(true)
       expect(component.lineNodeForScreenRow(0).textContent).toBe 'var quicksort = function () {'
 
+    it "does not assign an explicit line-height on the editor contents", ->
+      expect(componentNode.style.lineHeight).toBe ''
+
   describe "legacy editor compatibility", ->
     it "triggers the screen-lines-changed event before the editor:display-update event", ->
       editor.setSoftWrap(true)

src/editor-component.coffee

@@ -55,7 +55,8 @@ EditorComponent = React.createClass
     maxLineNumberDigits = editor.getLineCount().toString().length
     invisibles = if showInvisibles and not mini then @state.invisibles else {}
     hasSelection = editor.getSelection()? and !editor.getSelection().isEmpty()
-    style = {fontSize, lineHeight, fontFamily}
+    style = {fontSize, fontFamily}
+    style.lineHeight = lineHeight unless mini
 
     if @isMounted()
       renderedRowRange = @getRenderedRowRange()

static/editor.less

@@ -85,15 +85,18 @@
   }
 }
 
+.editor {
+  z-index: 0;
+  font-family: Inconsolata, Monaco, Consolas, 'Courier New', Courier;
+  line-height: 1.3;
+}
+
 .editor, .editor-contents {
   overflow: hidden;
   cursor: text;
   display: -webkit-flex;
   -webkit-user-select: none;
   position: relative;
-  z-index: 0;
-  font-family: Inconsolata, Monaco, Consolas, 'Courier New', Courier;
-  line-height: 1.3;
 }
 
 .editor .gutter .line-number.cursor-line {