CMakePM: Fix saving "Initial Configuration" values

Amends 6c5717844d

The CMakeBuildSystem::clearCMakeCache() would call
BuildSystem::emitParsingFinished which would clear the configuration in
the widget, effectively removing any "Initial Configuration" changes when
clicking on the "Re-configure with Initial Parameters" button.

This commit makes sure that the updateInitialCMakeArguments() function
is called before CMakeBuildSystem::clearCMakeCache(), and that only the
"Build > Clear CMake Configuration" action would
"disableCMakeBuildMenuActions" which is what an user would expect.

Fixes: QTCREATORBUG-31320
Change-Id: Ie7810c9bed000ca19a31a6ab8e7a281ae9f5e6f0
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -621,10 +621,10 @@ void CMakeBuildSettingsWidget::reconfigureWithInitialParameters()
     if (reply != QMessageBox::Yes)
         return;
 
-    m_buildConfig->cmakeBuildSystem()->clearCMakeCache();
-
     updateInitialCMakeArguments();
 
+    m_buildConfig->cmakeBuildSystem()->clearCMakeCache();
+
     if (ProjectExplorerPlugin::saveModifiedFiles())
         m_buildConfig->cmakeBuildSystem()->runCMake();
 }

src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp

@@ -1239,6 +1239,11 @@ void CMakeBuildSystem::clearCMakeCache()
         path.removeRecursively();
 
     emit configurationCleared();
+}
+
+void CMakeBuildSystem::disableCMakeBuildMenuActions()
+{
+    emitParsingStarted();
     emitParsingFinished(false);
 }
 

src/plugins/cmakeprojectmanager/cmakebuildsystem.h

@@ -77,6 +77,7 @@ public:
 
     bool persistCMakeState();
     void clearCMakeCache();
+    void disableCMakeBuildMenuActions();
 
     // Context menu actions:
     void buildCMakeTarget(const QString &buildTarget);

src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp

@@ -262,6 +262,7 @@ void CMakeManager::clearCMakeCache(BuildSystem *buildSystem)
     QTC_ASSERT(cmakeBuildSystem, return);
 
     cmakeBuildSystem->clearCMakeCache();
+    cmakeBuildSystem->disableCMakeBuildMenuActions();
 }
 
 void CMakeManager::runCMake(BuildSystem *buildSystem)