Don't auto-indent current line when pasting after non-whitespace characters

Signed-off-by: Nathan Sobo <nathan@github.com>

spec/text-editor-spec.coffee

@@ -3341,11 +3341,26 @@ describe "TextEditor", ->
             expect(editor.indentationForBufferRow(2)).toBe editor.indentationForBufferRow(1) + 1
 
         describe "when pasting", ->
-          it "auto-indents the pasted text", ->
-            atom.clipboard.write("console.log(x);\n")
-            editor.setCursorBufferPosition([5, 2])
-            editor.pasteText()
-            expect(editor.lineTextForBufferRow(5)).toBe("      console.log(x);")
+          describe "when only whitespace precedes the cursor", ->
+            it "auto-indents the lines spanned by the pasted text", ->
+              atom.clipboard.write("console.log(x);\nconsole.log(y);\n")
+              editor.setCursorBufferPosition([5, 2])
+              editor.pasteText()
+              expect(editor.lineTextForBufferRow(5)).toBe("      console.log(x);")
+              expect(editor.lineTextForBufferRow(6)).toBe("      console.log(y);")
+
+          describe "when non-whitespace characters precede the cursor", ->
+            it "does not auto-indent the first line being pasted", ->
+              editor.setText """
+                if (x) {
+                    y();
+                }
+              """
+
+              atom.clipboard.write(" z();")
+              editor.setCursorBufferPosition([1, Infinity])
+              editor.pasteText()
+              expect(editor.lineTextForBufferRow(1)).toBe("    y(); z();")
 
       describe 'when scoped settings are used', ->
         coffeeEditor = null

src/selection.coffee

@@ -4,6 +4,8 @@
 {Emitter} = require 'event-kit'
 Grim = require 'grim'
 
+NonWhitespaceRegExp = /\S/
+
 # Extended: Represents a selection in the {TextEditor}.
 module.exports =
 class Selection extends Model
@@ -368,13 +370,16 @@ class Selection extends Model
       @cursor.setBufferPosition(newBufferRange.end, skipAtomicTokens: true) if wasReversed
 
     if options.autoIndent
-      @editor.autoIndentBufferRow(row) for row in newBufferRange.getRows()
+      precedingText = @editor.getTextInBufferRange([[newBufferRange.start.row, 0], newBufferRange.start])
+      unless NonWhitespaceRegExp.test(precedingText)
+        @editor.autoIndentBufferRow(newBufferRange.getRows()[0])
+      @editor.autoIndentBufferRow(row) for row, i in newBufferRange.getRows() when i > 0
     else if options.autoIndentNewline and text == '\n'
       currentIndentation = @editor.indentationForBufferRow(newBufferRange.start.row)
       @editor.autoIndentBufferRow(newBufferRange.end.row, preserveLeadingWhitespace: true)
       if @editor.indentationForBufferRow(newBufferRange.end.row) < currentIndentation
         @editor.setIndentationForBufferRow(newBufferRange.end.row, currentIndentation)
-    else if options.autoDecreaseIndent and /\S/.test text
+    else if options.autoDecreaseIndent and NonWhitespaceRegExp.test(text)
       @editor.autoDecreaseIndentForBufferRow(newBufferRange.start.row)
 
     newBufferRange