tdf#130071 tdf#127815 qt5: Use ExtTextInput only for multi-char key events

Only call the SalEvent::ExtTextInput callback for key input events
if their text is longer than one character, in which case treating them
as SalEvent::KeyInput would produce incorrect results, given that only
the first character is set as the SalKeyEvent's mnCharCode below
(s.a. tdf#124118).
S.a. commit 61c8324394c690ced18ce692ab6d29c8031ad1a8
("#88063# fixed event handling for redflag", 2001-06-12)
which made events with text longer than 1 unicode char
to be handled by SalEvent::ExtTextInput for the gen VCL plugin even
if not in preedit mode.

Process other key events by calling SalEvent::KeyInput callback, which
e.g. makes shortcuts involving non-Latin characters (tdf#130071) and
auto-insertion of non-breaking spaces when typing French text
(tdf#127815) work.

The gtk3 and gen VCL plugins also use the length of the text as one
criterion to make a disctinction of whether to call SalEvent::ExtTextInput
or SalEvent::KeyInput, s. GtkSalFrame::IMHandler::signalIMCommit and
X11SalFrame::HandleKeyEvent. Those also take into account whether
in preedit mode, but for the qt5 case, input method events when using
e.g. ibus are handled in Qt5Widget::inputMethodEvent and the
Qt5Widget::handleKeyEvent code path is not used anyway.

Change-Id: I2f8925ea26a4fb5419226265c579242889e2a506
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89663
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins
(cherry picked from commit 1c6ea413cb01c0b482f87e625ba208eec230618a)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89670
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/vcl/qt5/Qt5Widget.cxx b/vcl/qt5/Qt5Widget.cxx
index 8c3d15b14efa..12e9a54f7f4f 100644
--- a/vcl/qt5/Qt5Widget.cxx
+++ b/vcl/qt5/Qt5Widget.cxx
@@ -420,7 +420,7 @@ bool Qt5Widget::handleKeyEvent(Qt5Frame& rFrame, const QWidget& rWidget, QKeyEve
                                const ButtonKeyState eState)
 {
     sal_uInt16 nCode = GetKeyCode(pEvent->key(), pEvent->modifiers());
-    if (eState == ButtonKeyState::Pressed && nCode == 0 && !pEvent->text().isEmpty()
+    if (eState == ButtonKeyState::Pressed && nCode == 0 && pEvent->text().length() > 1
         && rWidget.testAttribute(Qt::WA_InputMethodEnabled))
     {
         commitText(rFrame, pEvent->text());