TextEditor: skip auto completion while suggestion is visible

The use can still explicitly request completions in that case via the
keyboard shortcut.

Change-Id: I4ed47232a24288c540d1357c0f876a1cdfcfec08
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/texteditor/codeassist/codeassistant.cpp

@@ -444,6 +444,7 @@ void CodeAssistantPrivate::automaticProposalTimeout()
 {
     if (isWaitingForProposal()
         || m_editorWidget->multiTextCursor().hasMultipleCursors()
+        || m_editorWidget->suggestionVisible()
         || (isDisplayingProposal() && !m_proposalWidget->isFragile())) {
         return;
     }