reduce the number of changes to the boardedescriptor

Author: jantje

io.sloeber.core/src/io/sloeber/core/Activator.java

@@ -182,7 +182,7 @@ private static void registerListeners() {
 		CCorePlugin.getIndexManager().addIndexerStateListener(myindexerListener);
 		CoreModel singCoreModel = CoreModel.getDefault();
 		singCoreModel.addCProjectDescriptionListener(new ConfigurationChangeListener(),
-                CProjectDescriptionEvent.ALL);
+                CProjectDescriptionEvent.ABOUT_TO_APPLY);
 	}
 
 	private static void initializeImportantVariables() {

io.sloeber.core/src/io/sloeber/core/api/SloeberProject.java

@@ -400,7 +400,14 @@ private static void removeAllEraseEnvironmentVariables(IContributedEnvironment c
      * @param confDesc
      * @param boardDescription
      */
-    public void setBoardDescription(ICConfigurationDescription confDesc, BoardDescription boardDescription) {
+    public void setBoardDescription(ICConfigurationDescription confDesc, BoardDescription boardDescription,
+            boolean force) {
+        if (!force) {
+            BoardDescription curBoardDesc = myBoardDescriptions.get(confDesc.getId());
+            if (boardDescription.equals(curBoardDesc)) {
+                return;
+            }
+        }
         try {
             IProject project = confDesc.getProjectDescription().getProject();
             boolean isRebuildNeeded = true;

io.sloeber.core/src/io/sloeber/core/listeners/ConfigurationChangeListener.java

@@ -37,7 +37,7 @@ public void handleEvent(CProjectDescriptionEvent event) {
             ICProjectDescription newProjDesc = event.getNewCProjectDescription();
             ICConfigurationDescription newConf = newProjDesc.getActiveConfiguration();
             BoardDescription newBoardDescriptor = sloebberProject.getBoardDescription(newConf);
-            sloebberProject.setBoardDescription(newConf, newBoardDescriptor);
+            sloebberProject.setBoardDescription(newConf, newBoardDescriptor, false);
             break;
         }
         case CProjectDescriptionEvent.COPY_CREATED: {

io.sloeber.tests/src/io/sloeber/core/RegressionTest.java

@@ -112,7 +112,7 @@ public void issue555() {
         }
         SloeberProject arduinoProject = SloeberProject.getSloeberProject(theTestProject);
         ICProjectDescription cProjectDescription = CCorePlugin.getDefault().getProjectDescription(theTestProject);
-        arduinoProject.setBoardDescription(cProjectDescription.getActiveConfiguration(), teensyBoardid);
+        arduinoProject.setBoardDescription(cProjectDescription.getActiveConfiguration(), teensyBoardid, true);
 
         Shared.waitForAllJobsToFinish();
         try {

io.sloeber.ui/src/io/sloeber/ui/project/properties/BoardSelectionPage.java

@@ -401,7 +401,7 @@ private void doOK() {
 				BoardDescription boardDesc = curEntry.getValue();
 				try {
 					if ((curConfDesc != null) && (boardDesc != null)) {
-						sProject.setBoardDescription(curConfDesc, boardDesc);
+						sProject.setBoardDescription(curConfDesc, boardDesc, true);
 					} else {
 						Activator.log(new Status(IStatus.ERROR, Activator.getId(), Messages.error_adding_arduino_code));
 					}