Keep cursor position in the main view when toggling rev-filter

Note: this will work only if rev is a subset of the current branch.

This is a complement to c96dd26.

NEWS.adoc

@@ -14,7 +14,8 @@ Bug fixes:
 Improvements:
 
  - Open the blob corresponding to the diff line. (#1334)
- - Keep cursor position when toggling file-filter in the main view.
+ - Keep cursor position in the main view when toggling
+   file-filter and rev-filter.
  - Make errors visible in views showing Git output. (#1346)
  - Allow different colors for all references types.
  - Enable search in sections titles. (#1043)

src/prompt.c

@@ -874,8 +874,10 @@ prompt_toggle(struct view *view, const char *argv[], enum view_flag *flags)
 
 	toggle = find_option_info(option_toggles, ARRAY_SIZE(option_toggles), "", option);
 	if (toggle) {
-		if (view_has_flags(view, VIEW_FILE_FILTER) &&
-		    !strcmp(toggle->name, "file_filter"))
+		if ((view_has_flags(view, VIEW_FILE_FILTER) &&
+		     !strcmp(toggle->name, "file_filter")) ||
+		    (view_has_flags(view, VIEW_REV_FILTER) &&
+		     !strcmp(toggle->name, "rev_filter")))
 			string_copy_rev(view->env->goto_id, view->env->commit);
 		return prompt_toggle_option(view, argv, "", toggle, flags);
 	}