Find dialog will now use selection from active view as initial text.

src/source_base.cc

@@ -806,6 +806,14 @@ void Source::BaseView::paste() {
   scroll_to_cursor_delayed(this, false, false);
 }
 
+std::string Source::BaseView::get_selected_text() {
+  Gtk::TextIter start, end;
+  if(!get_buffer()->get_selection_bounds(start, end)) {
+    return {};
+  }
+  return get_buffer()->get_text(start, end);
+}
+
 void Source::BaseView::search_highlight(const std::string &text, bool case_sensitive, bool regex) {
   gtk_source_search_settings_set_case_sensitive(search_settings, case_sensitive);
   gtk_source_search_settings_set_regex_enabled(search_settings, regex);

src/source_base.h

@@ -64,6 +64,8 @@ namespace Source {
 
     void paste();
 
+    std::string get_selected_text();
+
     void search_highlight(const std::string &text, bool case_sensitive, bool regex);
     void search_forward();
     void search_backward();

src/window.cc

@@ -1446,6 +1446,12 @@ void Window::search_and_replace_entry() {
   });
   auto search_entry_it = EntryBox::get().entries.begin();
   search_entry_it->set_placeholder_text("Find");
+  if(auto view = Notebook::get().get_current_view()) {
+    auto const selected = view->get_selected_text();
+    if(!selected.empty()) {
+      search_entry_it->set_text(selected);
+    }
+  }
   if(auto view = Notebook::get().get_current_view()) {
     view->update_search_occurrences = [label_it](int number) {
       label_it->update(0, std::to_string(number));