[LyX/master] Implement wrapping in next-change (#10388).

[Juergen Spitzmueller]

commit f089f60f4e2aebd492065745610531a6f888cde8
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Oct 15 16:34:16 2016 +0200

    Implement wrapping in next-change (#10388).
---
 src/lyxfind.cpp |   42 +++++++++++++++++++++++++++++++++++++++---
 1 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/lyxfind.cpp b/src/lyxfind.cpp
index 38fcbfb..224e902 100644
--- a/src/lyxfind.cpp
+++ b/src/lyxfind.cpp
@@ -418,21 +418,57 @@ bool lyxreplace(BufferView * bv,
 }
 
 
-bool findNextChange(DocIterator & cur)
+bool findNextChange(BufferView * bv, Cursor & cur, bool const check_wrap)
 {
        for (; cur; cur.forwardPos())
                if (cur.inTexted() && cur.paragraph().isChanged(cur.pos()))
                        return true;
+
+       if (check_wrap) {
+               DocIterator cur_orig(bv->cursor());
+               docstring q = _("End of file reached while searching forward.\n"
+                         "Continue searching from the beginning?");
+               int wrap_answer = frontend::Alert::prompt(_("Wrap search?"),
+                       q, 0, 1, _("&Yes"), _("&No"));
+               if (wrap_answer == 0) {
+                       bv->cursor().clear();
+                       
bv->cursor().push_back(CursorSlice(bv->buffer().inset()));
+                       bv->clearSelection();
+                       cur.setCursor(bv->cursor().selectionBegin());
+                       if (findNextChange(bv, cur, false))
+                               return true;
+               }
+               bv->cursor().setCursor(cur_orig);
+       }
+
        return false;
 }
 
 
-bool findPreviousChange(DocIterator & cur)
+bool findPreviousChange(BufferView * bv, Cursor & cur, bool const check_wrap)
 {
        for (cur.backwardPos(); cur; cur.backwardPos()) {
                if (cur.inTexted() && cur.paragraph().isChanged(cur.pos()))
                        return true;
        }
+
+       if (check_wrap) {
+               DocIterator cur_orig(bv->cursor());
+               docstring q = _("Beginning of file reached while searching 
backward.\n"
+                         "Continue searching from the end?");
+               int wrap_answer = frontend::Alert::prompt(_("Wrap search?"),
+                       q, 0, 1, _("&Yes"), _("&No"));
+               if (wrap_answer == 0) {
+                       bv->cursor().setCursor(doc_iterator_end(&bv->buffer()));
+                       bv->cursor().backwardPos();
+                       bv->clearSelection();
+                       cur.setCursor(bv->cursor().selectionBegin());
+                       if (findPreviousChange(bv, cur, false))
+                               return true;
+               }
+               bv->cursor().setCursor(cur_orig);
+       }
+
        return false;
 }
 
@@ -477,7 +513,7 @@ bool findChange(BufferView * bv, bool forward)
        Cursor cur(*bv);
        cur.setCursor(forward ? bv->cursor().selectionEnd()
                      : bv->cursor().selectionBegin());
-       forward ? findNextChange(cur) : findPreviousChange(cur);
+       forward ? findNextChange(bv, cur, true) : findPreviousChange(bv, cur, 
true);
        return selectChange(cur, forward);
 }