[clang-format] Handle import when used as template function name (#169279)

Fixes #149960

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -5033,8 +5033,11 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
       return true;
     // Space between import <iostream>.
     // or import .....;
-    if (Left.is(Keywords.kw_import) && Right.isOneOf(tok::less, tok::ellipsis))
+    if (Left.is(Keywords.kw_import) &&
+        Right.isOneOf(tok::less, tok::ellipsis) &&
+        (!BeforeLeft || BeforeLeft->is(tok::kw_export))) {
       return true;
+    }
     // Space between `module :` and `import :`.
     if (Left.isOneOf(Keywords.kw_module, Keywords.kw_import) &&
         Right.is(TT_ModulePartitionColon)) {

clang/unittests/Format/FormatTest.cpp

@@ -27328,6 +27328,7 @@ TEST_F(FormatTest, Cpp20ModulesSupport) {
   verifyFormat("export", Style);
 
   verifyFormat("import /* not keyword */ = val ? 2 : 1;");
+  verifyFormat("_world->import<engine_module>();");
 }
 
 TEST_F(FormatTest, CoroutineForCoawait) {