Circumvent segfault when reloading list of tools; displaying a dialog box and clearing the focus seems to do the trick, probably some part of the old list of tools was in use and got replaced before being cleaned up properly.

SearchTools.py

@@ -21,7 +21,7 @@ OK Optimize so that it's not so slow
 OK speed up startup to show the box instantly and do the slow loading on first click.
 OK One small bug: when the 3D view is initialized, it causes a loss of focus on the drop-down. We restore it, but the currently-selected index is left unchanged, so the down or up arrow has to be pressed twice.
 * split into several files, try to keep the absolute minimum of code possible in the main file to speed up startup
-* segfault when reloading
+OK segfault when reloading
 """
 
 ################################""
@@ -106,7 +106,14 @@ def iconToHTML(icon, sz = 12, mode = QtGui.QIcon.Mode.Normal, state = QtGui.QIco
   return '<img width="'+str(sz)+'" height="'+str(sz)+'" src="data:image/png;base64,' + iconToBase64(icon, QtCore.QSize(sz,sz), mode, state) + '" />'
 def refreshToolsAction(act):
   print('Refresh list of tools')
-  refreshToolbars()
+  fw = QtGui.QApplication.focusWidget()
+  if fw is not None:
+    fw.clearFocus()
+  reply = QtGui.QMessageBox.question(None, "Load all workbenches?", "Load all workbenches? This can cause FreeCAD to become unstable, and this \"reload tools\" feature contained a bug that crashed freecad systematically, so please make sure you save your work before. It's a good idea to restart FreeCAD after this operation.", QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)
+  if reply == QtGui.QMessageBox.Yes:
+    refreshToolbars()
+  else:
+    print('cancelled')
 def toolbarAction(act):
   print('show toolbar ' + act['toolbar'] + ' from workbenches ' + repr(act['workbenches']))
 def subToolAction(act):