Minor cleanup and fixes to spell checking and smart paste

src/source.cc

@@ -745,6 +745,21 @@ void Source::View::paste() {
     }
   }
   
+  //Exception for when pasted text is only whitespaces
+  bool only_whitespaces=true;
+  for(auto &chr: text) {
+    if(chr!='\n' && chr!='\r' && chr!=' ' && chr!='\t') {
+      only_whitespaces=false;
+      break;
+    }
+  }
+  if(only_whitespaces) {
+    Gtk::Clipboard::get()->set_text(text);
+    get_buffer()->paste_clipboard(Gtk::Clipboard::get());
+    scroll_to_cursor_delayed(this, false, false);
+    return;
+  }
+  
   get_buffer()->begin_user_action();
   if(get_buffer()->get_has_selection()) {
     Gtk::TextIter start, end;

src/source_diff.cc

@@ -229,7 +229,7 @@ void Source::DiffView::configure() {
               status_branch=repository->get_branch();
               dispatcher.post([this] {
                 if(update_status_branch)
-                update_status_branch(this);
+                  update_status_branch(this);
               });
             }
             catch(const std::exception &) {

src/source_spellcheck.cc

@@ -65,7 +65,7 @@ Source::SpellCheckView::SpellCheckView() : Gsv::View() {
       else {
         auto previous_iter=iter;
         //When for instance using space to split two words
-        if(previous_iter.backward_char() && !is_word_iter(previous_iter)) {
+        if(previous_iter.backward_char() && (*previous_iter==' ' || *previous_iter=='-')) {
           auto first=previous_iter;
           auto second=iter;
           if(first.backward_char()) {
@@ -129,21 +129,20 @@ Source::SpellCheckView::SpellCheckView() : Gsv::View() {
   });
   
   // In case of for instance text paste or undo/redo
-  get_buffer()->signal_insert().connect([this](const Gtk::TextIter &end_iter, const Glib::ustring &inserted_string, int) {
+  get_buffer()->signal_insert().connect([this](const Gtk::TextIter &start_iter, const Glib::ustring &inserted_string, int) {
     if(spellcheck_checker==nullptr)
       return;
     if(inserted_string.size()<=1)
       return;
     
-    auto start_iter=end_iter;
-    start_iter.backward_chars(inserted_string.size());
-    if(!is_word_iter(start_iter) && !start_iter.starts_line())
-      start_iter.backward_char();
-    auto word=get_word(start_iter);
-    start_iter=word.first;
-    word=get_word(end_iter);
-    get_buffer()->remove_tag(spellcheck_error_tag, start_iter, word.second);
-  });
+    auto iter=start_iter;
+    if(!is_word_iter(iter) && !iter.starts_line())
+      iter.backward_char();
+    if(is_word_iter(iter)) {
+      auto word=get_word(iter);
+      get_buffer()->remove_tag(spellcheck_error_tag, word.first, word.second);
+    }
+  }, false);
   
   get_buffer()->signal_mark_set().connect([this](const Gtk::TextBuffer::iterator& iter, const Glib::RefPtr<Gtk::TextBuffer::Mark>& mark) {
     if(spellcheck_checker==nullptr)