2.5 filebrowser: previous/next + bugfix + elubie's changes and cleanup

* Previous/Next Folder browser
* bugfix: "open most recently opened directory".

* Previous and Next functionalities:
- use BACKSPACE to navigate to previous folders
- use SHIFT+BACKSPACE to navigate forward
- once you change the folder by other ways the forward folder list is cleared

* bug fix: the sfile->params->dir set through ED_fileselect_set_params wasn't correct. According to the code taking the settings from the existing (previous) filebrowser is a temp solution. In that case this is a fix for a temp solution :)
(changes in: wm_event_system.c, filesel.c and ED_fileselect.h)

** Andrea(elubie): we can get away of the folderlist_clear_next test if we manually pass a boolean to file_change_dir (e.g. file_change_dir(sfile, true)). I tried not to mess up with your changes here. It's slightly slower (and maybe hacky) but its's more conservative IMHO.

(my first commit to 2.5 ... that was a good reason to put my paper on hold :p)

1 files changed, 2 insertions, 5 deletions

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 93de096e7b4..fd86c436558 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -4472,13 +4472,10 @@ void lib_link_screen_restore(Main *newmain, bScreen *curscreen, Scene *curscene)
 					
 					SpaceFile *sfile= (SpaceFile *)sl;
 					sfile->files= NULL;
+					sfile->folders_prev= NULL;
+					sfile->folders_next= NULL;
 					sfile->params= NULL;
 					sfile->op= NULL;
-					/* XXX needs checking - best solve in filesel itself 
-					if(sfile->libfiledata)	
-						BLO_blendhandle_close(sfile->libfiledata);
-					sfile->libfiledata= 0;
-					*/
 				}
 				else if(sl->spacetype==SPACE_IMASEL) {
                     SpaceImaSel *simasel= (SpaceImaSel *)sl;