diff --git a/NEWS.md b/NEWS.md
index 3f6a3ad9..f784df60 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -11,6 +11,9 @@ Red Panda C++ Version 2.16
   - fix: Can't correctly parse function pointer var definition.
   - enhancement: Improve support for function pointer typedefs.
   - enhancement: Improve support for function pointer vars.
+  - enhancement: When first display two editor panes, auto make them the same width
+  - change: Don't rebuild the whole project when run/debug, if only contents of project unit file is modified.
+  - fix: rebuild may not work, if project's parallel build option is enabled.
 
 Red Panda C++ Version 2.15
 
diff --git a/RedPandaIDE/compiler/compiler.cpp b/RedPandaIDE/compiler/compiler.cpp
index 267706ff..71c20397 100644
--- a/RedPandaIDE/compiler/compiler.cpp
+++ b/RedPandaIDE/compiler/compiler.cpp
@@ -62,6 +62,9 @@ void Compiler::run()
         QElapsedTimer timer;
         timer.start();
         runCommand(mCompiler, mArguments, mDirectory, pipedText());
+        for(int i=0;i<mExtraArgumentsList.count();i++) {
+            runCommand(mExtraCompilersList[i],mExtraArgumentsList[i],mDirectory, pipedText());
+        }
         log("");
         log(tr("Compile Result:"));
         log("------------------");
diff --git a/RedPandaIDE/compiler/compiler.h b/RedPandaIDE/compiler/compiler.h
index f012a748..8cc493c8 100644
--- a/RedPandaIDE/compiler/compiler.h
+++ b/RedPandaIDE/compiler/compiler.h
@@ -90,6 +90,8 @@ protected:
     bool mOnlyCheckSyntax;
     QString mCompiler;
     QString mArguments;
+    QStringList mExtraCompilersList;
+    QStringList mExtraArgumentsList;
     QString mOutputFile;
     int mErrorCount;
     int mWarningCount;
diff --git a/RedPandaIDE/compiler/projectcompiler.cpp b/RedPandaIDE/compiler/projectcompiler.cpp
index 25aca783..c9115eb7 100644
--- a/RedPandaIDE/compiler/projectcompiler.cpp
+++ b/RedPandaIDE/compiler/projectcompiler.cpp
@@ -603,10 +603,14 @@ bool ProjectCompiler::prepareForCompile()
                                                             mProject->directory(),
                                                             mProject->makeFileName()));
     } else if (mRebuild) {
-        mArguments = QString(" %1 -f \"%2\" clean all").arg(parallelParam,
-                                                            extractRelativePath(
+        mArguments = QString(" -f \"%1\" clean").arg(extractRelativePath(
                                                             mProject->directory(),
                                                             mProject->makeFileName()));
+        mExtraCompilersList.append(mCompiler);
+        mExtraArgumentsList.append(QString(" %1 -f \"%2\" all").arg(parallelParam,
+                                                            extractRelativePath(
+                                                            mProject->directory(),
+                                                            mProject->makeFileName())));
     } else {
         mArguments = QString(" %1 -f \"%2\" all").arg(parallelParam,
                                                       extractRelativePath(
@@ -619,6 +623,9 @@ bool ProjectCompiler::prepareForCompile()
     log("--------");
     log(tr("- makefile processer: %1").arg(mCompiler));
     log(tr("- Command: %1 %2").arg(extractFileName(mCompiler)).arg(mArguments));
+    for(int i=0;i<mExtraCompilersList.count();i++) {
+        log(tr("- Command: %1 %2").arg(extractFileName(mExtraCompilersList[i])).arg(mExtraArgumentsList[i]));
+    }
     log("");
 
     return true;
diff --git a/RedPandaIDE/editorlist.cpp b/RedPandaIDE/editorlist.cpp
index c1319a3c..6485fff1 100644
--- a/RedPandaIDE/editorlist.cpp
+++ b/RedPandaIDE/editorlist.cpp
@@ -103,6 +103,14 @@ void EditorList::showLayout(LayoutShowType layout)
     case LayoutShowType::lstBoth:
         mLeftPageWidget->setVisible(true);
         mRightPageWidget->setVisible(true);
+        {
+            QList<int> sizes=mSplitter->sizes();
+            int total = sizes[0]+sizes[1];
+            sizes[0] = total / 2;
+            sizes[1] = total - sizes[0];
+            mSplitter->setSizes(sizes);
+        }
+        break;
     }
 }
 
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index c6205a9f..d349d163 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -2051,7 +2051,19 @@ void MainWindow::runExecutable(RunType runType)
         QStringList binDirs = mProject->binDirs();
         QFileInfo execInfo(mProject->executable());
         QDateTime execModTime = execInfo.lastModified();
+        if (execInfo.exists() && mProject->modifiedSince(execModTime)) {
+            //if project options changed, or units added/removed
+            //mProject->saveAll();
+            mCompileSuccessionTask=std::make_shared<CompileSuccessionTask>();
+            mCompileSuccessionTask->type = CompileSuccessionTaskType::RunNormal;
+            mCompileSuccessionTask->execName=mProject->executable();
+            mCompileSuccessionTask->isExecutable=true;
+            mCompileSuccessionTask->binDirs=binDirs;
+            compile(true);
+            return;
+        }
         if (execInfo.exists() && mProject->unitsModifiedSince(execModTime)) {
+            //if units modified;
             //mProject->saveAll();
             mCompileSuccessionTask=std::make_shared<CompileSuccessionTask>();
             mCompileSuccessionTask->type = CompileSuccessionTaskType::RunNormal;
@@ -2166,7 +2178,8 @@ void MainWindow::debug()
         {
             QFileInfo execInfo(mProject->executable());
             QDateTime execModTime = execInfo.lastModified();
-            if (execInfo.exists() && mProject->unitsModifiedSince(execModTime)) {
+            if (execInfo.exists() && mProject->modifiedSince(execModTime)) {
+                //if project options changed, or units added/removed
                 //mProject->saveAll();
                 mCompileSuccessionTask=std::make_shared<CompileSuccessionTask>();
                 mCompileSuccessionTask->type = CompileSuccessionTaskType::Debug;
@@ -2176,6 +2189,17 @@ void MainWindow::debug()
                 compile(true);
                 return;
             }
+            if (execInfo.exists() && mProject->unitsModifiedSince(execModTime)) {
+                //if units modified
+                //mProject->saveAll();
+                mCompileSuccessionTask=std::make_shared<CompileSuccessionTask>();
+                mCompileSuccessionTask->type = CompileSuccessionTaskType::Debug;
+                mCompileSuccessionTask->execName=mProject->executable();
+                mCompileSuccessionTask->isExecutable=true;
+                mCompileSuccessionTask->binDirs=binDirs;
+                compile();
+                return;
+            }
         }
         // Did we choose a host application for our DLL?
         if (mProject->options().type == ProjectType::DynamicLib) {
diff --git a/RedPandaIDE/project.cpp b/RedPandaIDE/project.cpp
index e3c1116e..a23beb81 100644
--- a/RedPandaIDE/project.cpp
+++ b/RedPandaIDE/project.cpp
@@ -189,8 +189,6 @@ bool Project::modifiedSince(const QDateTime &time)
 {
     if (modified())
         return true;
-    if (unitsModifiedSince(time))
-        return true;
     QFileInfo info(filename());
     return (info.lastModified()>time);
 }