...in which case .. path segments need to be resolved in SearchPath, too

...for cases like

> In file included from vcl/source/outdev/hatch.cxx:32:
> vcl/source/outdev/../gdi/pdfwriter_impl.hxx:47:10: error: replace "..." include form with <...> for inclusion of a source file not next to the current source file, or a header, vcl/source/outdev/../gdi/pdffontcache.hxx [loplugin:includeform]
> #include "pdffontcache.hxx"
>          ^~~~~~~~~~~~~~~~~~

Change-Id: Ib486e0cf16a157b90f838536a15c40c2a34ef72b

compilerplugins/clang/includeform.cxx

@@ -52,6 +52,8 @@ private:
                    || loplugin::hasPathnamePrefix(
                        SearchPath, WORKDIR "/UnpackedTarball"));
         } else {
+            auto dir1 = std::string(SearchPath);
+            loplugin::normalizeDotDotInFilePath(dir1);
             auto const file = StringRef(
                 compiler.getSourceManager().getPresumedLoc(HashLoc)
                 .getFilename());
@@ -64,9 +66,9 @@ private:
                 pos = pos2;
             }
 #endif
-            auto dir = std::string(compat::take_front(file, pos));
-            loplugin::normalizeDotDotInFilePath(dir);
-            shouldUseAngles = !loplugin::isSamePathname(SearchPath, dir);
+            auto dir2 = std::string(compat::take_front(file, pos));
+            loplugin::normalizeDotDotInFilePath(dir2);
+            shouldUseAngles = !loplugin::isSamePathname(dir1, dir2);
         }
         if (shouldUseAngles == IsAngled) {
             return;