CMakePM: Filter out external and CMake internal files as project files

The number of cmake files set to `project()->setExtraProjectFiles` went
for a project like Qt Creator from 1533 to 489.

Task-number: QTCREATORBUG-32209
Change-Id: I3ad69a41c01f1de534b6a7621c3323b5f4912558
Reviewed-by: Alessandro Portale <[email protected]>

1 files changed, 6 insertions, 5 deletions

diff --git a/src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp b/src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp
index 3541e9fd55c..ca23831cbaa 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp
@@ -1566,11 +1566,12 @@ void CMakeBuildSystem::checkAndReportError(QString &errorMessage)
 
 static QSet<FilePath> projectFilesToWatch(const QSet<CMakeFileInfo> &cmakeFiles)
 {
-    return Utils::transform(Utils::filtered(cmakeFiles,
-                                            [](const CMakeFileInfo &info) {
-                                                return !info.isGenerated;
-                                            }),
-                            [](const CMakeFileInfo &info) { return info.path; });
+    QSet<FilePath> result;
+    for (const CMakeFileInfo &info : cmakeFiles) {
+        if (!info.isGenerated && !info.isCMake && !info.isExternal)
+            result.insert(info.path);
+    }
+    return result;
 }
 
 void CMakeBuildSystem::updateProjectData()