Improve the auto-signature insertion algorithm

* Append the signature only after the e-mail Reader thread will finish
  it's work. This prevent from inserting the signature in wrong place;
* Added extra lines between original e-mail quote and the signature for
  more comfortable editing of replies.
* This fix was made during GCI2011;
* This fixes #4590.

Signed-off-by: Siarzhuk Zharski <zharik@gmx.li>

src/apps/mail/Content.cpp

@@ -702,6 +702,13 @@ TContentView::MessageReceived(BMessage *msg)
 
 		case M_SIGNATURE:
 		{
+			if (fTextView->IsReaderThreadRunning()) {
+				// Do not add the signature until the reader thread
+				// is finished. Resubmit the message for later processing
+				Window()->PostMessage(msg);
+				break;
+			}
+
 			entry_ref ref;
 			msg->FindRef("ref", &ref);
 
@@ -727,21 +734,23 @@ TContentView::MessageReceived(BMessage *msg)
 				const char *text = fTextView->Text();
 				int32 length = fTextView->TextLength();
 
-				if (length && text[length - 1] != '\n') {
-					fTextView->Select(length, length);
+				// reserve some empty lines before the signature
+				const char* newLines = "\n\n\n\n";
+				if (length && text[length - 1] == '\n')
+					newLines++;
 
-					char newLine = '\n';
-					fTextView->Insert(&newLine, 1);
-
-					length++;
-				}
+				fTextView->Select(length, length);
+				fTextView->Insert(newLines, strlen(newLines));
+				length += strlen(newLines);
 
+				// append the signature
 				fTextView->Select(length, length);
 				fTextView->Insert(signature, bytesRead);
 				fTextView->Select(length, length + bytesRead);
 				fTextView->ScrollToSelection();
 
-				fTextView->Select(start, finish);
+				// set the editing cursor position
+				fTextView->Select(length - 2 , length - 2);
 				fTextView->ScrollToSelection();
 				free (signature);
 			} else {
@@ -2086,6 +2095,20 @@ TTextView::StopLoad()
 }
 
 
+bool
+TTextView::IsReaderThreadRunning()
+{
+	if (fThread == 0)
+		return false;
+
+	thread_info info;
+	for (int i = 5; i > 0; i--, usleep(100000))
+		if (get_thread_info(fThread, &info) != B_OK)
+			return false;
+	return true;
+}
+
+
 void
 TTextView::AddAsContent(BEmailMessage *mail, bool wrap, uint32 charset, mail_encoding encoding)
 {

src/apps/mail/Content.h

@@ -168,6 +168,7 @@ class TTextView : public BTextView {
 		void Open(hyper_text*);
 		status_t Save(BMessage *, bool makeNewFile = true);
 		void StopLoad();
+		bool IsReaderThreadRunning();
 		void AddAsContent(BEmailMessage *mail, bool wrap, uint32 charset, mail_encoding encoding);
 		void CheckSpelling(int32 start, int32 end,
 			int32 flags = S_CLEAR_ERRORS | S_SHOW_ERRORS);

src/apps/mail/MailWindow.cpp

@@ -534,22 +534,15 @@ TMailWindow::TMailWindow(BRect rect, const char* title, TMailApp* app,
 			// If we find the named query, add it to the text.
 			BEntry entry;
 			if (query.GetNextEntry(&entry) == B_NO_ERROR) {
-				off_t size;
 				BFile file;
 				file.SetTo(&entry, O_RDWR);
 				if (file.InitCheck() == B_NO_ERROR) {
-					file.GetSize(&size);
-					char *str = (char *)malloc(size);
-					size = file.Read(str, size);
+					entry_ref ref;
+					entry.GetRef(&ref);
 
-					fContentView->fTextView->Insert(str, size);
-					fContentView->fTextView->GoToLine(0);
-					fContentView->fTextView->ScrollToSelection();
-
-					fStartingText = (char *)malloc(size
-						= strlen(fContentView->fTextView->Text()) + 1);
-					if (fStartingText != NULL)
-						strcpy(fStartingText, fContentView->fTextView->Text());
+					BMessage msg(M_SIGNATURE);
+					msg.AddRef("ref", &ref);
+					PostMessage(&msg);
 				}
 			} else {
 				char tempString [2048];