Add Document::setModified(bool) to the scripting api

BUG:425066
(cherry picked from commit 78aedaf4b49bbfdda4473b187f5026d4de43908b)

libs/libkis/Document.cpp

@@ -902,6 +902,12 @@ bool Document::modified() const
     return d->document->isModified();
 }
 
+void Document::setModified(bool modified)
+{
+    if (!d->document) return;
+    d->document->setModified(modified);
+}
+
 QRect Document::bounds() const
 {
     if (!d->document) return QRect();

libs/libkis/Document.h

@@ -778,6 +778,12 @@ print(root.childNodes())
      */
     bool modified() const;
 
+    /**
+     * @brief setModified sets the modified status of the document
+     * @param modified if true, the document is considered modified and closing it will ask for saving.
+     */
+    void setModified(bool modified);
+
     /**
      * @brief bounds return the bounds of the image
      * @return the bounds

plugins/extensions/pykrita/sip/krita/Document.sip

@@ -84,6 +84,7 @@ public Q_SLOTS:
     void setGuidesVisible(bool visible);
     void setGuidesLocked(bool locked);
     bool modified() const;
+    void setModified(bool modified);
     QRect bounds() const;
     bool importAnimation(const QList<QString> &files, int firstFrame, int step);
     int framesPerSecond();