fix: Ask user to save modified script before new one

This will avoid losing the changes made to the script when the user
tries to create or open a new script without saving the current one.

src/gui/scriptpanel.cpp

@@ -172,16 +172,34 @@ void ScriptPanel::setupNewFile(const QString &scriptText, int cursorLeftMove)
 
 void ScriptPanel::newScript()
 {
+    if (!checkNeedToSaveScript())
+        return;
     setupNewFile(DefaultScript, 3);
     m_editDialogButton->hide();
 }
 
 void ScriptPanel::newScriptDialog()
 {
+    if (!checkNeedToSaveScript())
+        return;
     setupNewFile(DefaultScriptDialog, 9);
     m_editDialogButton->show();
 }
 
+bool ScriptPanel::checkNeedToSaveScript()
+{
+    const auto text = toPlainText();
+    if (text.isEmpty() || text == DefaultScript || text == DefaultScriptDialog)
+        return true;
+
+    const auto ret = QMessageBox::question(this, tr("Save Script"), tr("Do you want to save the script?"),
+                                           QMessageBox::Save | QMessageBox::No | QMessageBox::Cancel);
+
+    if (ret == QMessageBox::Save)
+        saveScript();
+    return ret != QMessageBox::Cancel;
+}
+
 void ScriptPanel::saveScript()
 {
     const bool isQml = toPlainText().contains("import Knut");

src/gui/scriptpanel.h

@@ -45,6 +45,7 @@ class ScriptPanel : public QPlainTextEdit
     void openScript();
     void newScript();
     void newScriptDialog();
+    bool checkNeedToSaveScript();
     void saveScript();
     void editDialog();
     void checkEditDialogButton();