WM: keep the current state when a blend fails to load

Previously many operations would run on file load, even if the file
did not load. Pre/post load handlers were called, timers canceled,
all undo data freed, editors exited ... etc.

Now keep the blend file in it's current state.

This simplifies updating this area of code as there is one less
possible situation to account for.

1 files changed, 37 insertions, 35 deletions

diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index 3bf925af2ce..2d1342da2fb 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -713,8 +713,6 @@ bool WM_file_read(bContext *C, const char *filepath, ReportList *reports)
 
   WM_cursor_wait(true);
 
-  wm_file_read_pre(C, use_data, use_userdef);
-
   /* first try to append data from exotic file formats... */
   /* it throws error box when file doesn't exist and returns -1 */
   /* note; it should set some error message somewhere... (ton) */
@@ -722,13 +720,6 @@ bool WM_file_read(bContext *C, const char *filepath, ReportList *reports)
 
   /* we didn't succeed, now try to read Blender file */
   if (retval == BKE_READ_EXOTIC_OK_BLEND) {
-    const int G_f_orig = G.f;
-    ListBase wmbase;
-
-    /* put aside screens to match with persistent windows later */
-    /* also exit screens and editors */
-    wm_window_match_init(C, &wmbase);
-
     const struct BlendFileReadParams params = {
         .is_startup = false,
         /* Loading preferences when the user intended to load a regular file is a security
@@ -739,42 +730,50 @@ bool WM_file_read(bContext *C, const char *filepath, ReportList *reports)
 
     struct BlendFileData *bfd = BKE_blendfile_read(filepath, &params, reports);
     if (bfd != NULL) {
+      wm_file_read_pre(C, use_data, use_userdef);
+
+      /* Put aside screens to match with persistent windows later,
+       * also exit screens and editors. */
+      ListBase wmbase;
+      wm_window_match_init(C, &wmbase);
+
+      /* This flag is initialized by the operator but overwritten on read.
+       * need to re-enable it here else drivers + registered scripts wont work. */
+      const int G_f_orig = G.f;
+
       BKE_blendfile_read_setup(C, bfd, &params, reports);
-      success = true;
-    }
 
-    /* BKE_file_read sets new Main into context. */
-    Main *bmain = CTX_data_main(C);
+      if (G.f != G_f_orig) {
+        const int flags_keep = G_FLAG_ALL_RUNTIME;
+        G.f &= G_FLAG_ALL_READFILE;
+        G.f = (G.f & ~flags_keep) | (G_f_orig & flags_keep);
+      }
 
-    /* When recovering a session from an unsaved file, this can have a blank path. */
-    if (BKE_main_blendfile_path(bmain)[0] != '\0') {
-      G.save_over = 1;
-      G.relbase_valid = 1;
-    }
-    else {
-      G.save_over = 0;
-      G.relbase_valid = 0;
-    }
+      /* #BKE_blendfile_read_result_setup sets new Main into context. */
+      Main *bmain = CTX_data_main(C);
 
-    /* this flag is initialized by the operator but overwritten on read.
-     * need to re-enable it here else drivers + registered scripts wont work. */
-    if (G.f != G_f_orig) {
-      const int flags_keep = G_FLAG_ALL_RUNTIME;
-      G.f &= G_FLAG_ALL_READFILE;
-      G.f = (G.f & ~flags_keep) | (G_f_orig & flags_keep);
-    }
+      /* When recovering a session from an unsaved file, this can have a blank path. */
+      if (BKE_main_blendfile_path(bmain)[0] != '\0') {
+        G.save_over = 1;
+        G.relbase_valid = 1;
+      }
+      else {
+        G.save_over = 0;
+        G.relbase_valid = 0;
+      }
 
-    /* match the read WM with current WM */
-    wm_window_match_do(C, &wmbase, &bmain->wm, &bmain->wm);
-    WM_check(C); /* opens window(s), checks keymaps */
+      /* match the read WM with current WM */
+      wm_window_match_do(C, &wmbase, &bmain->wm, &bmain->wm);
+      WM_check(C); /* opens window(s), checks keymaps */
 
-    if (success) {
       if (do_history_file_update) {
         wm_history_file_update();
       }
-    }
 
-    wm_file_read_post(C, false, false, use_data, use_userdef, false);
+      wm_file_read_post(C, false, false, use_data, use_userdef, false);
+
+      success = true;
+    }
   }
 #if 0
   else if (retval == BKE_READ_EXOTIC_OK_OTHER) {
@@ -951,6 +950,9 @@ void wm_homefile_read(bContext *C,
 #endif /* WITH_PYTHON */
   }
 
+  /* For regular file loading this only runs after the file is successfully read.
+   * In the case of the startup file, the in-memory startup file is used as a fallback
+   * so we know this will work if all else fails. */
   wm_file_read_pre(C, use_data, use_userdef);
 
   if (use_data) {