Select matching entry in editor file dialog when saving file

Also scroll to the entry with the matching filename when opening the editor file dialog for saving instead of only when the filename input is changed.

src/game/editor/editor.cpp

@@ -5158,6 +5158,10 @@ void CEditor::RenderFileDialog()
 		Ui()->DoLabel(&PathBox, aBuf, 10.0f, TEXTALIGN_ML);
 	}
 
+	// filebox
+	static CListBox s_ListBox;
+	s_ListBox.SetActive(!Ui()->IsPopupOpen());
+
 	const auto &&UpdateFileNameInput = [this]() {
 		if(m_FilesSelectedIndex >= 0 && !m_vpFilteredFileList[m_FilesSelectedIndex]->m_IsDir)
 		{
@@ -5168,10 +5172,22 @@ void CEditor::RenderFileDialog()
 		else
 			m_FileDialogFileNameInput.Clear();
 	};
-
-	// filebox
-	static CListBox s_ListBox;
-	s_ListBox.SetActive(!Ui()->IsPopupOpen());
+	const auto &&UpdateSelectedIndex = [&]() {
+		m_FilesSelectedIndex = -1;
+		m_aFilesSelectedName[0] = '\0';
+		// find first valid entry, if it exists
+		for(size_t i = 0; i < m_vpFilteredFileList.size(); i++)
+		{
+			if(str_comp_nocase(m_vpFilteredFileList[i]->m_aName, m_FileDialogFileNameInput.GetString()) == 0)
+			{
+				m_FilesSelectedIndex = i;
+				str_copy(m_aFilesSelectedName, m_vpFilteredFileList[i]->m_aName);
+				break;
+			}
+		}
+		if(m_FilesSelectedIndex >= 0)
+			s_ListBox.ScrollToSelected();
+	};
 
 	if(m_FileDialogSaveAction)
 	{
@@ -5187,24 +5203,17 @@ void CEditor::RenderFileDialog()
 					--i;
 				}
 			}
-			m_FilesSelectedIndex = -1;
-			m_aFilesSelectedName[0] = '\0';
-			// find first valid entry, if it exists
-			for(size_t i = 0; i < m_vpFilteredFileList.size(); i++)
-			{
-				if(str_comp_nocase(m_vpFilteredFileList[i]->m_aName, m_FileDialogFileNameInput.GetString()) == 0)
-				{
-					m_FilesSelectedIndex = i;
-					str_copy(m_aFilesSelectedName, m_vpFilteredFileList[i]->m_aName);
-					break;
-				}
-			}
-			if(m_FilesSelectedIndex >= 0)
-				s_ListBox.ScrollToSelected();
+			UpdateSelectedIndex();
 		}
 
 		if(m_FileDialogOpening)
+		{
 			Ui()->SetActiveItem(&m_FileDialogFileNameInput);
+			if(!m_FileDialogFileNameInput.IsEmpty())
+			{
+				UpdateSelectedIndex();
+			}
+		}
 	}
 	else
 	{