[clang-format-vs] Format the whole document if nothing is selected

[berenm]

Summary

By default, clang-format VS plugin only reformats the selected code.

To reformat the whole document, the user has to select everything before calling the reformat shortcut.

[djasper]

If nothing is selected, clang-format should format the current line.. At
least that's the intended behavior. Doesn't it do that?

tools/clang-format-vs/ClangFormat/ClangFormatPackage.cs

                 // We're not in a text view.
                 return;
             string text = view.TextBuffer.CurrentSnapshot.GetText();
-            int start = view.Selection.Start.Position.GetContainingLine().Start.Position;
-            int end = view.Selection.End.Position.GetContainingLine().End.Position;
+            int start = 0;
+            int end = text.Length;
+            if (!view.Selection.IsEmpty)
+            {
+                start = view.Selection.Start.Position.GetContainingLine().Start.Position;
+                end = view.Selection.End.Position.GetContainingLine().End.Position;
+            }
             int length = end - start;
             // clang-format doesn't support formatting a range that starts at the end
             // of the file.