PY-28752 Show full origin when suggesting symbols from existing "from" imports

python/src/com/jetbrains/python/codeInsight/imports/ImportCandidateHolder.java

@@ -154,7 +154,7 @@ public class ImportCandidateHolder implements Comparable<ImportCandidateHolder>
       sb.append(StringUtil.repeat(".", fromImportStatement.getRelativeLevel()));
       final PyReferenceExpression source = fromImportStatement.getImportSource();
       if (source != null) {
-        sb.append(source.getReferencedName());
+        sb.append(source.asQualifiedName());
       }
     }
     return sb.toString();

python/testData/quickFixes/PyAddImportQuickFixTest/fullFromImportSourceNameInSuggestion/foo/bar/baz.py

@@ -0,0 +1,6 @@
+class ClassA:
+    pass
+
+
+class ClassB:
+    pass

python/testData/quickFixes/PyAddImportQuickFixTest/fullFromImportSourceNameInSuggestion/main.py

@@ -0,0 +1,3 @@
+from foo.bar.baz import ClassA
+
+print(ClassA, <error descr="Unresolved reference 'ClassB'">Cla<caret>ssB</error>)

python/testData/quickFixes/PyAddImportQuickFixTest/fullFromImportSourceNameInSuggestion/main_after.py

@@ -0,0 +1,3 @@
+from foo.bar.baz import ClassA, ClassB
+
+print(ClassA, ClassB)

python/testSrc/com/jetbrains/python/quickFixes/PyAddImportQuickFixTest.java

@@ -100,7 +100,7 @@ public class PyAddImportQuickFixTest extends PyQuickFixTestCase {
   public void testExistingImportsAlwaysSuggestedFirstEvenIfLonger() {
     doMultiFileAutoImportTest("Import", quickfix -> {
       final List<String> candidates = ContainerUtil.map(quickfix.getCandidates(), c -> c.getPresentableText("ClassB"));
-      assertOrderedEquals(candidates, "ClassB from path", "short.ClassB");
+      assertOrderedEquals(candidates, "ClassB from long.pkg.path", "short.ClassB");
       return false;
     });
   }
@@ -114,6 +114,11 @@ public class PyAddImportQuickFixTest extends PyQuickFixTestCase {
     });
   }
 
+  // PY-28752
+  public void testFullFromImportSourceNameInSuggestion() {
+    doMultiFileAutoImportTest("Import 'ClassB from foo.bar.baz'");
+  }
+
   private void doMultiFileAutoImportTest(@NotNull String hintPrefix) {
     doMultiFileAutoImportTest(hintPrefix, null);
   }