Fix undo UI text containing shortcuts & newlines

- Shortcuts were being shown in the undo history.
- Multi-line tool-tips now only use the first line.

source/blender/editors/interface/interface_handlers.c

@@ -171,7 +171,7 @@ static bool ui_mouse_motion_keynav_test(struct uiKeyNavLock *keynav, const wmEve
 /* pixels to move the cursor to get out of keyboard navigation */
 #define BUTTON_KEYNAV_PX_LIMIT 8
 
-#define MENU_TOWARDS_MARGIN 20      /* margin in pixels */
+#define MENU_TOWARDS_MARGIN 20 /* margin in pixels */
 #define MENU_TOWARDS_WIGGLE_ROOM 64 /* tolerance in pixels */
 /* drag-lock distance threshold in pixels */
 #define BUTTON_DRAGLOCK_THRESH 3
@@ -822,21 +822,25 @@ static void ui_apply_but_undo(uiBut *but)
 {
   if (but->flag & UI_BUT_UNDO) {
     const char *str = NULL;
+    size_t str_len_clip = SIZE_MAX - 1;
     bool skip_undo = false;
 
     /* define which string to use for undo */
     if (but->type == UI_BTYPE_MENU) {
       str = but->drawstr;
+      str_len_clip = ui_but_drawstr_len_without_sep_char(but);
     }
     else if (but->drawstr[0]) {
       str = but->drawstr;
+      str_len_clip = ui_but_drawstr_len_without_sep_char(but);
     }
     else {
       str = but->tip;
+      str_len_clip = ui_but_tip_len_only_first_line(but);
     }
 
     /* fallback, else we don't get an undo! */
-    if (str == NULL || str[0] == '\0') {
+    if (str == NULL || str[0] == '\0' || str_len_clip == 0) {
       str = "Unknown Action";
     }
 
@@ -873,7 +877,7 @@ static void ui_apply_but_undo(uiBut *but)
 
     /* delayed, after all other funcs run, popups are closed, etc */
     uiAfterFunc *after = ui_afterfunc_new();
-    BLI_strncpy(after->undostr, str, sizeof(after->undostr));
+    BLI_strncpy(after->undostr, str, min_zz(str_len_clip + 1, sizeof(after->undostr)));
   }
 }
 

source/blender/editors/interface/interface_intern.h

@@ -1088,6 +1088,9 @@ uiBut *ui_list_find_mouse_over_ex(struct ARegion *region, int x, int y) ATTR_WAR
 
 bool ui_but_contains_password(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 
+size_t ui_but_drawstr_len_without_sep_char(const uiBut *but);
+size_t ui_but_tip_len_only_first_line(const uiBut *but);
+
 uiBut *ui_but_prev(uiBut *but) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_but_next(uiBut *but) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_but_first(uiBlock *block) ATTR_WARN_UNUSED_RESULT;

source/blender/editors/interface/interface_query.c

@@ -446,6 +446,32 @@ bool ui_but_contains_password(const uiBut *but)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Button (#uiBut) Text
+ * \{ */
+
+size_t ui_but_drawstr_len_without_sep_char(const uiBut *but)
+{
+  if (but->flag & UI_BUT_HAS_SEP_CHAR) {
+    const char *str_sep = strrchr(but->drawstr, UI_SEP_CHAR);
+    if (str_sep != NULL) {
+      return (str_sep - but->drawstr);
+    }
+  }
+  return strlen(but->drawstr);
+}
+
+size_t ui_but_tip_len_only_first_line(const uiBut *but)
+{
+  const char *str_sep = strchr(but->tip, '\n');
+  if (str_sep != NULL) {
+    return (str_sep - but->tip);
+  }
+  return strlen(but->tip);
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Block (#uiBlock) State
  * \{ */