fix chat scroll bug

src/line_info.c

@@ -209,6 +209,10 @@ void line_info_add(ToxWindow *self, uint8_t *tmstmp, uint8_t *name1, uint8_t *na
 void line_info_print(ToxWindow *self)
 {
     ChatContext *ctx = self->chatwin;
+
+    if (ctx == NULL)
+        return;
+
     WINDOW *win = ctx->history;
 
     ctx->hst->queue = 0;

src/main.c

@@ -453,8 +453,10 @@ void *thread_winref(void *data)
 {
     Tox *m = (Tox *) data;
 
-    while (true)
+    while (true) {
         draw_active_window(m);
+        refresh_inactive_windows();
+    }
 }
 
 int main(int argc, char *argv[])

src/windows.c

@@ -426,6 +426,22 @@ void draw_active_window(Tox *m)
     }
 }
 
+/* refresh inactive windows to prevent scrolling bugs. 
+   call at least once per second */
+void refresh_inactive_windows(void)
+{
+    int i;
+
+    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+        ToxWindow *a = &windows[i];
+
+        if (!a->active || a == active_window || a->is_prompt)  /* if prompt doesn't have scroll mode */
+            continue;
+
+        line_info_print(a);
+    }
+}
+
 int get_num_active_windows(void)
 {
     return num_active_windows;