Add changes file for Qt 5.12.3

+ f5bad874 Doc: Copy minimal example code into overview page
+ fd2acd57 Clarify documentation of QWebEnginePage::title()
+ 598bfc65 Doc: Always treat \brief as full sentence
+ 837347e1 Fix handling of touch icons when it is disabled
+ 1f77d470 Fix crash on dynamic_cast in global event filter
+ 4263778b Quicknanobrowser: Hide status bubble properly
+ 0091ec90 Doc: Fix JavaScriptDialogRequest.DialogTypeBeforeUnload enum value
+ 8600d3d2 Fix incrementing download ID
+ ddfa2997 Fix destruction of qt quick profile after WebEngineContext gets deleted
+ 56fadb57 Force destruction of webcontent client before profile adapter
+ 2bf39d83 Expose missing translations to lupdate
+ ac147ec3 Fix warning: implicit conversion of NULL constant to 'const int'
+ eedee8d3 Update Chromium
+ cbeef3ee Do not report client redirects as link-clicked
+ 3efb842b Bump version
+ 01c763c8 Fix tabbing in recipebrowser
+ c8d11a21 Fixup focus implementation
+ 54ac91fd Fix markdown rendering of titles in recipebrowser
+ 1fe5566c Fix regression in setting background colors
+ ea65bb32 Switch to setting 'official build' for non developer builds
+ 159a1c8d Update Chromium
+ 0d135113 Fix escaped characters in tooltip
+ dad0cfa3 Fix style of media audio controls
+ 1110b9b5

 Fix timestamp deduplication for Windows

Change-Id: I9636039392c9f043885f22aeabb161fc3ce10079
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-5.12.3

+Qt 5.12.3 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.12.0 through 5.12.2.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+https://doc.qt.io/qt-5/index.html
+
+The Qt version 5.12 series is binary compatible with the 5.11.x series.
+Applications compiled for 5.11 will continue to run with 5.12.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                              Qt 5.12.3 Changes                           *
+****************************************************************************
+
+Behavior Changes
+----------------
+
+ - [QTBUG-74490] Client side redirects are no longer reported as link clicked.
+
+Chromium
+--------
+
+ - Security fixes from Chromium up to version 73.0.3683.75, including:
+
+    * CVE-2019-5787
+    * CVE-2019-5789
+    * CVE-2019-5790
+    * CVE-2019-5791
+    * CVE-2019-5792
+    * CVE-2019-5793
+    * CVE-2019-5794
+    * CVE-2019-5795
+    * CVE-2019-5797
+    * CVE-2019-5802
+    * CVE-2019-5803
+    * Security issue 905509
+    * Security issue 906437
+    * Security issue 906652
+    * Security issue 906739
+    * Security issue 913212
+    * Security issue 914511
+    * Security issue 916874
+    * Security issue 917608
+    * Security issue 917707
+    * Security issue 919340
+    * Security issue 919572
+    * Security issue 924905
+    * Security issue 929088
+    * Security issue 931640
+    * Security issue 938251
+    * Security issue 933743
+
+
+General
+-------
+
+ - [QTBUG-73833] Fixed crash with dynamic_cast in event filter.
+ - [QTBUG-74021] Fixed crash on exit if the app leaked a page.
+ - [QTBUG-74116] Fixed crash on exit for rare QML setup.
+ - [QTBUG-74484] Fixed default style of media controls for audio playback.
+ - [QTBUG-74519] Fixed regression in setting background colors.
+ - [QTBUG-74659] Fixed quotes and other characters being escaped in tooltips.
+ - [QTBUG-74764] Fixed deduplication naming of 100+ downloads on Windows.
+
+
+Examples
+--------
+
+ - Quicknanobrowser status bubble hid correctly.
+ - Recipebrowser rendering and tabbing fixed.