Alex Villacís Lasso : richedit: Only notify selection change when selection has actually changed from previous notification .

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1fa39b50c0bafeb72e85c257391e6cd5fb70182d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=1fa39b50c0bafeb72e85c257391e6cd5fb70182d

Author: Alex Villacís Lasso <a_villacis at palosanto.com>
Date:   Sun Apr 27 13:08:55 2008 -0500

richedit: Only notify selection change when selection has actually changed from previous notification.

Otherwise, redundant and early notifications are sent to apps that do not expect them. Fixes crash #1 with Perfect! TextEdit.

---

 dlls/riched20/caret.c   |   10 +++++++++-
 dlls/riched20/editor.c  |    2 ++
 dlls/riched20/editstr.h |    3 +++
 3 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/dlls/riched20/caret.c b/dlls/riched20/caret.c
index bf53aff..b2172ac 100644
--- a/dlls/riched20/caret.c
+++ b/dlls/riched20/caret.c
@@ -1330,7 +1330,15 @@ void ME_SendSelChange(ME_TextEditor *editor)
     sc.seltyp |= SEL_TEXT;
   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
     sc.seltyp |= SEL_MULTICHAR;
-  SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
+  TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
+    sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
+    (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
+    (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
+  if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
+  {
+    editor->notified_cr = sc.chrg;
+    SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
+  }
 }
 
 BOOL
diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 3121293..660942f 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -1665,6 +1665,8 @@ ME_TextEditor *ME_MakeEditor(HWND hWnd) {
   else
     ed->cPasswordMask = 0;
   
+  ed->notified_cr.cpMin = ed->notified_cr.cpMax = 0;
+
   return ed;
 }
 
diff --git a/dlls/riched20/editstr.h b/dlls/riched20/editstr.h
index aedaefa..1e2c770 100644
--- a/dlls/riched20/editstr.h
+++ b/dlls/riched20/editstr.h
@@ -331,6 +331,9 @@ typedef struct tagME_TextEditor
   /*for IME */
   int imeStartIndex;
   DWORD selofs, linesel, sely;
+
+  /* Track previous notified selection */
+  CHARRANGE notified_cr;
 } ME_TextEditor;
 
 typedef struct tagME_Context