Merge branch '2.2' into 3.0

# Conflicts:
#	.github/workflows/testing.yml
#	CHANGELOG
#	README.md
#	dev-requirements.txt
#	gns3server/compute/docker/docker_vm.py
#	gns3server/controller/export_project.py
#	gns3server/controller/import_project.py
#	gns3server/controller/project.py
#	gns3server/crash_report.py
#	gns3server/static/web-ui/index.html
#	gns3server/static/web-ui/main.df8c319a3da6fb0e3629.js
#	gns3server/version.py
#	requirements.txt
#	setup.py
#	tests/compute/docker/test_docker_vm.py
#	tests/controller/test_import_project.py

gns3server/controller/export_project.py

@@ -89,14 +89,15 @@ async def export_project(
             files = [f for f in files if _is_exportable(os.path.join(root, f), include_snapshots)]
             for file in files:
                 path = os.path.join(root, file)
-                # check if we can export the file
-                try:
-                    open(path).close()
-                except OSError as e:
-                    msg = f"Could not export file {path}: {e}"
-                    log.warning(msg)
-                    project.emit_notification("log.warning", {"message": msg})
-                    continue
+                if not os.path.islink(path):
+                    try:
+                        # check if we can export the file
+                        open(path).close()
+                    except OSError as e:
+                        msg = f"Could not export file {path}: {e}"
+                        log.warning(msg)
+                        project.emit_notification("log.warning", {"message": msg})
+                        continue
                 # ignore the .gns3 file
                 if file.endswith(".gns3"):
                     continue
@@ -150,7 +151,10 @@ def _patch_mtime(path):
     :param path: file path
     """
 
-    st = os.stat(path)
+    if sys.platform.startswith("win"):
+        # only UNIX type platforms
+        return
+    st = os.stat(path, follow_symlinks=False)
     file_date = datetime.fromtimestamp(st.st_mtime)
     if file_date.year < 1980:
         new_mtime = file_date.replace(year=1980).timestamp()
@@ -166,10 +170,6 @@ def _is_exportable(path, include_snapshots=False):
     if include_snapshots is False and path.endswith("snapshots"):
         return False
 
-    # do not export symlinks
-    if os.path.islink(path):
-        return False
-
     # do not export directories of snapshots
     if include_snapshots is False and "{sep}snapshots{sep}".format(sep=os.path.sep) in path:
         return False
@@ -228,13 +228,16 @@ async def _patch_project_file(
                 if not keep_compute_ids:
                     node["compute_id"] = "local"  # To make project portable all node by default run on local
 
-                if "properties" in node and node["node_type"] != "docker":
+                if "properties" in node:
                     for prop, value in node["properties"].items():
 
                         # reset the MAC address
                         if reset_mac_addresses and prop in ("mac_addr", "mac_address"):
                             node["properties"][prop] = None
 
+                        if node["node_type"] == "docker":
+                            continue
+
                         if node["node_type"] == "iou":
                             if not prop == "path":
                                 continue