From 6ca06347b6b72584e7fc0a2cc21125a0d23cba95 Mon Sep 17 00:00:00 2001
From: stefan schippers <stefan.schippers@gmail.com>
Date: Tue, 23 Sep 2025 02:08:17 +0200
Subject: [PATCH] when switching to a different tab/window the related
 schematic will be marked as dirty (asterisk) if underlying file is changed.

---
 src/xinit.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/xinit.c b/src/xinit.c
index 464d31f1..53982f6f 100644
--- a/src/xinit.c
+++ b/src/xinit.c
@@ -1552,6 +1552,8 @@ static int switch_window(int *window_count, const char *win_path, int tcl_ctx)
     }
     /* if window was closed then tkwin == 0 --> do nothing */
     if(tkwin && n >= 0 && n < MAX_NEW_WINDOWS) {
+      struct stat buf;
+ 
       if(tcl_ctx) tclvareval("save_ctx ", xctx->current_win_path, NULL);
       xctx = save_xctx[n];
       if(tcl_ctx) {
@@ -1559,7 +1561,12 @@ static int switch_window(int *window_count, const char *win_path, int tcl_ctx)
         tclvareval("housekeeping_ctx", NULL);
       }
       if(tcl_ctx && has_x) tclvareval("reconfigure_layers_button {}", NULL);
-      set_modify(-1); /* sets window title */
+      if(!stat( xctx->sch[xctx->currsch], &buf) && xctx->time_last_modify &&
+          xctx->time_last_modify != buf.st_mtime) {
+        set_modify(1);
+      } else {
+        set_modify(-1); /* sets window title */
+      }
       return 0;
     } else return 1;
   }
@@ -1596,6 +1603,7 @@ static int switch_tab(int *window_count, const char *win_path, int dr)
     dbg(1, "new_schematic() switch_tab: %s\n", new_path);
     /* if no matching tab found --> do nothing */
     if(n >= 0 && n < MAX_NEW_WINDOWS) {
+      struct stat buf;
       if(xctx->current_win_path) {
         my_strncpy(previous_win_path, xctx->current_win_path, sizeof(previous_win_path));
       }
@@ -1607,7 +1615,13 @@ static int switch_tab(int *window_count, const char *win_path, int dr)
       if(has_x) tclvareval("reconfigure_layers_button {}", NULL);
       xctx->window = save_xctx[0]->window;
       if(dr) resetwin(1, 1, 1, 0, 0);
-      set_modify(-1); /* sets window title */
+        /* file exists and modification time on disk has changed since file loaded ... */
+      if(!stat( xctx->sch[xctx->currsch], &buf) && xctx->time_last_modify &&
+          xctx->time_last_modify != buf.st_mtime) {
+        set_modify(1);
+      } else {
+        set_modify(-1); /* sets window title */
+      }
       if(dr) draw();
       return 0;
     } else return 1;