avoid interaction problem of tabbed/non-tabbed windows

docs/mintty.1

@@ -268,7 +268,7 @@ or hidden.
 Use \fICLASS\fP as the window class name of the main window.
 This allows window grouping or setup of different tab sets, 
 and it allows scripting tools to distinguish different mintty instances.
-The default is "mintty".
+The default is "mintty\fI_N\fP", including tabbed window sync level if > 1.
 
 .TQ
 \fB\-d\fP, \fB\-\-nodaemon\fP
@@ -2767,11 +2767,14 @@ Setting only one of X, Y is not supported.
 See command-line option \fB\-p\fP for further positioning options.
 
 .TQ
-\fBWindow class name\fP (Class=mintty)
+\fBWindow class name\fP (Class=mintty\fI_N\fP)
 The \fBClass\fP setting determines the name of the window class of the terminal window.
 It can be used to distinguish or group different mintty windows, or tab sets, e.g. for 
 the mintty session switcher, or for Windows scripting tools such as AutoHotKey.
 
+The default setting appends the tabbed window sync level (>1) to avoid 
+interaction issues between tabbed and non-tabbed windows.
+
 For a flexible grouping configuration, the Class option supports the 
 same \fB%s\fP placeholder parameters as the AppID option.
 

src/winmain.c

@@ -769,6 +769,12 @@ win_hide_other_tabs(HWND to_top)
     if (class_atom == curr_wnd_info.atomWindowType) {
       //printf("[%p] hiding %p (unless top %p)\n", wnd, curr_wnd, to_top);
       if (curr_wnd != to_top && !IsIconic(curr_wnd)) {
+#ifdef debug_hiding
+        int len = GetWindowTextLengthW(curr_wnd);
+        wchar t[len + 1];
+        GetWindowTextW(curr_wnd, t, len + 1);
+        printf("hiding <%ls>\n", t);
+#endif
         // do not use either of 
         // ShowWindow(SW_HIDE) or SetWindowPos(SWP_HIDEWINDOW);
         // it is hard to restore from those states and window handling 
@@ -7089,6 +7095,15 @@ main(int argc, char *argv[])
   wstring wclass = W(APPNAME);
   if (*cfg.class)
     wclass = group_id(cfg.class);
+  if (cfg.geom_sync > 1) {
+    char * class = cs__wcstoutf(wclass);
+    char * syncclass = asform("%s_%d", class, cfg.geom_sync);
+    free(class);
+    set_arg_option("Class", syncclass);
+    wclass = cs__utftowcs(syncclass);
+    free(syncclass);
+  }
+
 #ifdef prevent_grouping_hidden_tabs
   // should an explicitly hidden window not be grouped with a "class" of tabs?
   if (!cfg.window)

wiki/Changelog.md

@@ -19,6 +19,7 @@ Mouse and menu handling
   * Allow disabling of mouse menus by clearing Menu* (#1279).
 
 Window handling
+  * Avoid interaction problem of tabbed/non-tabbed windows.
   * Tweak initial window display, mitigate bright flash (#1284).
 
 Configuration