Exact word bubble doesn't disappear when screen is tapped (fix part 2)

Prevent syncing with native side, if input capability changes are
pending. Native side seems to be rather touchy about extra events,
and might crash if syncing is requested while handling a capability
change is on-going.

Additionally, only cancel the transaction once. Otherwise cancellation
might lead into loop (since we sync the state with native side) that
eventually causes the application to crash.

Task-number: QTBUG-20919
Reviewed-by: Miikka Heikkinen

2 files changed, 11 insertions, 4 deletions

diff --git a/src/gui/inputmethod/qcoefepinputcontext_p.h b/src/gui/inputmethod/qcoefepinputcontext_p.h
index 9857015..8c30838 100644
--- a/src/gui/inputmethod/qcoefepinputcontext_p.h
+++ b/src/gui/inputmethod/qcoefepinputcontext_p.h
@@ -154,6 +154,7 @@ private:
     TUint m_textCapabilities;
     bool m_inDestruction;
     bool m_pendingInputCapabilitiesChanged;
+    bool m_pendingTransactionCancel;
     int m_cursorVisibility;
     int m_inlinePosition;
     MFepInlineTextFormatRetriever *m_formatRetriever;
diff --git a/src/gui/inputmethod/qcoefepinputcontext_s60.cpp b/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
index 8bdaa22..9cf4212 100644
--- a/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
+++ b/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
@@ -109,6 +109,7 @@ QCoeFepInputContext::QCoeFepInputContext(QObject *parent)
       m_textCapabilities(TCoeInputCapabilities::EAllText),
       m_inDestruction(false),
       m_pendingInputCapabilitiesChanged(false),
+      m_pendingTransactionCancel(false),
       m_cursorVisibility(1),
       m_inlinePosition(0),
       m_formatRetriever(0),
@@ -1074,12 +1075,10 @@ void QCoeFepInputContext::CancelFepInlineEdit()
     // We are not supposed to ever have a tempPreeditString and a real preedit string
     // from S60 at the same time, so it should be safe to rely on this test to determine
     // whether we should honor S60's request to clear the text or not.
-    if (m_hasTempPreeditString)
+    if (m_hasTempPreeditString || m_pendingTransactionCancel)
         return;
 
-    // Sync with native side editor state. Native side can then do various operations
-    // based on editor state, such as removing 'exact word bubble'.
-    ReportAknEdStateEvent(MAknEdStateObserver::EAknSyncEdwinState);
+    m_pendingTransactionCancel = true;
 
     QList<QInputMethodEvent::Attribute> attributes;
     QInputMethodEvent event(QLatin1String(""), attributes);
@@ -1087,6 +1086,13 @@ void QCoeFepInputContext::CancelFepInlineEdit()
     m_preeditString.clear();
     m_inlinePosition = 0;
     sendEvent(event);
+
+    // Sync with native side editor state. Native side can then do various operations
+    // based on editor state, such as removing 'exact word bubble'.
+    if (!m_pendingInputCapabilitiesChanged)
+        ReportAknEdStateEvent(MAknEdStateObserver::EAknSyncEdwinState);
+
+    m_pendingTransactionCancel = false;
 }
 
 TInt QCoeFepInputContext::DocumentLengthForFep() const