fix broken icon path after new icon structure in GUI * community-news.cc: use window icon configured in the preferences * documentation-dock-widget.cc (documentation_dock_widget) * files-dock-widget.cc (files_dock_widget) * history-dock-widget.cc (history_dock_widget) * terminal-dock-widget.cc (terminal_dock_widget) * variable-editor.cc (variable_editor) * workspace-view.cc (workspace_view) do not set window icon here as it is set in the main window * gui-preferences-dw.h: organize dw_icon_set_names in a hash * file-editor.cc (notice_settings): fix path to tab close icon on mac * find-dialog.cc (find_dialog): do not set window icon here, it is already set by the editor * main-window.cc (notice_settings): set dok widget icons using the new hash structure of available icon sets (construct): use global const settings instead of literal string for main window icon * octave-qobject.cc (release_notes_widget): pass base qobject to the release note constructor * release-notes.cc (release_notes): get qbase object as argument, get desired window icon from settings * release-notes.h: constructor with base object as argument * variable-editor.cc (toplevel_change): use icon path from const preferences instead of literal strings * welcome-wizard.cc (make_octave_logo): use icon path from const preferences instead of literal strings

Update bootstrap script from upstream gnulib to automatically fetch from repository if needed

See also: https://lists.gnu.org/archive/html/bug-gnulib/2020-08/msg00150.html

diff --git a/bootstrap b/bootstrap
index 8f76d6962..2d0a06376 100755
--- a/bootstrap
+++ b/bootstrap
@@ -670,6 +670,11 @@ if $use_gnulib; then
         || cleanup_gnulib
 
       trap - 1 2 13 15
+
+    elif test -n "$GNULIB_REVISION" \
+         && ! git --git-dir="$gnulib_path"/.git cat-file \
+              commit "$GNULIB_REVISION"; then
+      git --git-dir="$gnulib_path"/.git fetch
     fi
     GNULIB_SRCDIR=$gnulib_path
     ;;
@@ -704,6 +709,10 @@ if $use_gnulib; then
 
   if test -d "$GNULIB_SRCDIR"/.git && test -n "$GNULIB_REVISION" \
      && ! git_modules_config submodule.gnulib.url >/dev/null; then
+    if ! git --git-dir="$GNULIB_SRCDIR"/.git cat-file \
+         commit "$GNULIB_REVISION"; then
+      git --git-dir="$GNULIB_SRCDIR"/.git fetch
+    fi
     (cd "$GNULIB_SRCDIR" && git checkout "$GNULIB_REVISION") || cleanup_gnulib
   fi