PY-21458 Fixed: Live template hangs PyCharm in some case

Don't analyze implicit imports while searching iterable variable for live template

python/testSrc/com/jetbrains/python/codeInsight/liveTemplates/PyLiveTemplatesExpandingTest.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2000-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.jetbrains.python.codeInsight.liveTemplates;
+
+import com.intellij.codeInsight.lookup.Lookup;
+import com.intellij.codeInsight.lookup.LookupManager;
+import com.intellij.codeInsight.lookup.impl.LookupImpl;
+import com.intellij.codeInsight.template.impl.actions.ListTemplatesAction;
+import com.intellij.openapi.command.WriteCommandAction;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.project.Project;
+import com.jetbrains.python.fixtures.PyTestCase;
+
+public class PyLiveTemplatesExpandingTest extends PyTestCase {
+
+  @Override
+  protected String getTestDataPath() {
+    return super.getTestDataPath() + "/codeInsight/liveTemplates/expanding/";
+  }
+
+  public void testIterableVariableFromImplicitImports() {
+    doMultiFileTest();
+  }
+
+  private void doMultiFileTest() {
+    myFixture.copyDirectoryToProject(getTestName(false), "");
+    myFixture.configureByFile("a.py");
+
+    final Editor editor = myFixture.getEditor();
+    final Project project = myFixture.getProject();
+
+    WriteCommandAction.runWriteCommandAction(
+      project,
+      () -> {
+        new ListTemplatesAction().actionPerformedImpl(project, editor);
+        final LookupImpl lookup = (LookupImpl)LookupManager.getActiveLookup(editor);
+        assertNotNull(lookup);
+        lookup.finishLookup(Lookup.NORMAL_SELECT_CHAR);
+      }
+    );
+
+    myFixture.checkResultByFile(getTestName(false) + "/a_after.py");
+  }
+}