Release v0.6.38: avoid unnecessary RichEdit and cancel hidden history previews

tests/input.cpp

@@ -912,6 +912,7 @@ int main(int argc, char **argv) {
             ks::showHistory(app,false);
             auto history=app.historyWindow;
             require(history&&!IsWindowVisible(history),"history layout tested without changing focus");
+            require(!GetDlgItem(history,105),"history creates no RichEdit control before formatted content is displayed");
             {
                 app.history=std::make_unique<ks::History>(temp/L"history-search");
                 app.history->add(ks::textClip(L"згенеруй приклад"),L"test",app.settings);
@@ -941,7 +942,9 @@ int main(int argc, char **argv) {
                 require(GetFocus()==originalFocus,"history search preserves focus");
                 SendDlgItemMessageW(history,102,LB_SETCURSEL,1,0);
                 ks::refreshHistory(app); // A result may still be in flight when closing.
-                SendMessageW(history,WM_CLOSE,0,0);
+                SendDlgItemMessageW(history,101,WM_KEYDOWN,VK_ESCAPE,0);
+                require(!IsWindowVisible(history) && !GetDlgItem(history,105),
+                        "Escape closes history and leaves no RichEdit control");
                 SendMessageW(history,WM_TIMER,1,0); // KillTimer cannot retract a posted timer message.
                 require(pumpUntil(0),"closing history releases list strings");
                 auto until=GetTickCount64()+250;