GUI: prepare for replace undo

src/gui/findReplace.cpp

@@ -189,6 +189,12 @@ void FurnaceGUI::doFind() {
   queryViewingResults=true;
 }
 
+/* issues with the find and replace function:
+   - doesn't mark the module as modified
+   - can't undo
+   - replace notes to anything starting from C-0 to lower notes will have an octave higher, so set it to replace to C-0 it will becom C-1, b_1 will become B-0 and so on
+*/
+
 void FurnaceGUI::doReplace() {
   doFind();
   queryViewingResults=false;
@@ -399,6 +405,10 @@ void FurnaceGUI::doReplace() {
   for (int i=0; i<DIV_MAX_CHANS; i++) {
     if (touched[i]!=NULL) delete[] touched[i];
   }
+
+  if (!curQueryResults.empty()) {
+    MARK_MODIFIED;
+  }
 }
 
 #define FIRST_VISIBLE(x) (x==GUI_QUERY_MATCH || x==GUI_QUERY_MATCH_NOT || x==GUI_QUERY_RANGE || x==GUI_QUERY_RANGE_NOT)