data_document: extract Q_FIXED to impl from .h

WIP.
Related to #240.

Telegram/CMakeLists.txt

@@ -258,6 +258,7 @@ add_executable(Kepka WIN32 MACOSX_BUNDLE
     SourceFiles/core/utils.cpp
 
     SourceFiles/data/data_abstract_structure.cpp
+    SourceFiles/data/data_document.cpp
     SourceFiles/data/data_drafts.cpp
     SourceFiles/data/data_game.cpp
     SourceFiles/data/data_photo.cpp

Telegram/SourceFiles/data/data_document.cpp

@@ -0,0 +1,37 @@
+//
+// This file is part of Kepka,
+// an unofficial desktop version of Telegram messaging app,
+// see https://github.com/procxx/kepka
+//
+// Kepka is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// It is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// In addition, as a special exception, the copyright holders give permission
+// to link the code of portions of this program with the OpenSSL library.
+//
+// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
+// Copyright (c) 2019- Kepka Contributors, https://github.com/procxx
+//
+/// @file data/data_document.cpp Implementation and internals (and Qt QFixed)
+/// @todo Get rid of QFixed.
+
+#include "data/data_document.h"
+#include "private/qfixed_p.h"
+#include <QTextEdit>
+
+void MessageCursor::fillFrom(const QTextEdit *edit) {
+	QTextCursor c = edit->textCursor();
+	position = c.position();
+	anchor = c.anchor();
+	QScrollBar *s = edit->verticalScrollBar();
+	scroll = (s && (s->value() != s->maximum())) ? s->value() : QFIXED_MAX;
+}
+
+const int MessageCursor::kMaxScroll = QFIXED_MAX;

Telegram/SourceFiles/data/data_document.h

@@ -37,7 +37,7 @@
 
 #include "scheme.h"
 
-#include "private/qfixed_p.h" // QFIXED_MAX, warn: temporary, should be eliminated.
+class QTextEdit;
 
 class HistoryItem;
 
@@ -522,6 +522,7 @@ QString saveFileName(const QString &title, const QString &filter, const QString
 MsgId clientMsgId();
 
 struct MessageCursor {
+	static const int kMaxScroll;
 	MessageCursor() = default;
 	MessageCursor(int position, int anchor, int scroll)
 	    : position(position)
@@ -530,13 +531,7 @@ struct MessageCursor {
 	MessageCursor(const QTextEdit *edit) {
 		fillFrom(edit);
 	}
-	void fillFrom(const QTextEdit *edit) {
-		QTextCursor c = edit->textCursor();
-		position = c.position();
-		anchor = c.anchor();
-		QScrollBar *s = edit->verticalScrollBar();
-		scroll = (s && (s->value() != s->maximum())) ? s->value() : QFIXED_MAX;
-	}
+	void fillFrom(const QTextEdit *edit);
 	void applyTo(QTextEdit *edit) {
 		auto cursor = edit->textCursor();
 		cursor.setPosition(anchor, QTextCursor::MoveAnchor);
@@ -548,7 +543,7 @@ struct MessageCursor {
 	}
 	int position = 0;
 	int anchor = 0;
-	int scroll = QFIXED_MAX;
+	int scroll = kMaxScroll;
 };
 
 inline bool operator==(const MessageCursor &a, const MessageCursor &b) {