text viewer: reworks screen access logics and some bugs fix.

- screen access logics separte from tv_window. (new tv_display.[ch])
- using multi screen api.
- (bug fix) the head of the each line is not normally displayed when the alignment is RIGHT.
- (bug fix) unnecessary blank line is not displayed. (a part of FS#11400).
- (bug fix) the order by which callback functions were called was not correct. (FIFO->FILO)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27138 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/text_viewer/tv_text_processor.c

@@ -512,7 +512,8 @@ int tv_create_formed_text(const unsigned char *src, ssize_t bufsize,
     tv_get_ucs(src, &ch);
     is_indent = (tv_isspace(ch) && !is_break_line);
 
-    if (is_indent && preferences->indent_spaces == 0 && (expand_extra_line = !expand_extra_line) == true)
+    if (is_indent && preferences->line_mode == LM_REFLOW && preferences->indent_spaces == 0
+                  && (expand_extra_line = !expand_extra_line) == true)
         return 0;
 
     for (i = 0; i < block_count; i++)