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From 0c20ed4d58f7b55bcc12fa288b93d1c6d88a7dcc Mon Sep 17 00:00:00 2001
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From: Stephan Bergmann <sbergman@redhat.com>
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Date: Thu, 14 May 2020 14:47:21 +0200
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Subject: [PATCH] Keep order of GDK input events intact
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As explained at <https://bugzilla.redhat.com/show_bug.cgi?id=1377293#c12>
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"[Wayland] When typing fast at high CPU load, LibreOffice breaks key (letter)
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order": "with a local LO master --with-lang=ALL ASan+UBSan build (i.e., which
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executes somewhat slowly): When typing 'file' in Writer right after it started
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up (but no longer after more typing), that gets garbled as 'fiel'." The reason
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for that (but probably not for the original issue reported in that rhbz#1377293)
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apparently was:
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Two GDK_KEY_PRESS events (A and B) were in the GTK event queue.
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GtkInstance::AnyInput consumed only A, because it broke from the first while
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loop as soon as it saw the first event of appropriate type. In the second while
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loop it put A back on the end of the GTK event loop, so that it now followed B.
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GtkSalFrame::signalKey (vcl/unx/gtk3/gtk3gtkframe.cxx) thus received the events
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in the wrong order.
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Dropping the "break" also reveals that GtkInstance::AnyInput should obviously
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use a queue (i.e., deque) rather than a stack to hold the events it consumed and
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needs to re-enqueue.
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This appears to be a regression introduced with
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658954e8b50fc264428402dc5a95b0d6f690d191 "Resolves: fdo#48011 writer
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idle-callbacks are halting when events pending".
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Change-Id: I87d601df118a20ea3dd59e9cebbcf5176db04be8
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---
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vcl/unx/gtk/gtkinst.cxx | 9 ++++-----
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1 file changed, 4 insertions(+), 5 deletions(-)
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diff --git a/vcl/unx/gtk/gtkinst.cxx b/vcl/unx/gtk/gtkinst.cxx
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index 02ed688f366b..744c66b0baf0 100644
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--- a/vcl/unx/gtk/gtkinst.cxx
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+++ b/vcl/unx/gtk/gtkinst.cxx
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@@ -427,25 +427,24 @@ bool GtkInstance::AnyInput( VclInputFlags nType )
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return true;
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bool bRet = false;
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- std::stack<GdkEvent*> aEvents;
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+ std::deque<GdkEvent*> aEvents;
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GdkEvent *pEvent = nullptr;
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while ((pEvent = gdk_event_get()))
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{
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- aEvents.push(pEvent);
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+ aEvents.push_back(pEvent);
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VclInputFlags nEventType = categorizeEvent(pEvent);
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if ( (nEventType & nType) || ( nEventType == VclInputFlags::NONE && (nType & VclInputFlags::OTHER) ) )
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{
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bRet = true;
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- break;
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}
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}
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while (!aEvents.empty())
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{
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- pEvent = aEvents.top();
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+ pEvent = aEvents.front();
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gdk_event_put(pEvent);
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gdk_event_free(pEvent);
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- aEvents.pop();
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+ aEvents.pop_front();
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}
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#endif
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return bRet;
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--
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2.25.4
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