[LyX/master] #12434 add GUI debug messages for pinch-to-zoom gesture

[Stephan Witt]

commit 22045e455aeb1ecec4507331e4e171bdf21c116d
Author: Stephan Witt <sw...@lyx.org>
Date:   Sun Jan 9 12:29:02 2022 +0100

    #12434 add GUI debug messages for pinch-to-zoom gesture
---
 src/frontends/qt/GuiView.cpp |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt/GuiView.cpp b/src/frontends/qt/GuiView.cpp
index 91e8229..5cf4fce 100644
--- a/src/frontends/qt/GuiView.cpp
+++ b/src/frontends/qt/GuiView.cpp
@@ -1632,11 +1632,15 @@ bool GuiView::event(QEvent * e)
                if (gp) {
                        QPinchGesture *pinch = static_cast<QPinchGesture *>(gp);
                        QPinchGesture::ChangeFlags changeFlags = 
pinch->changeFlags();
+                       qreal totalScaleFactor = pinch->totalScaleFactor();
+                       LYXERR(Debug::GUI, "totalScaleFactor: " << 
totalScaleFactor);
                        if (pinch->state() == Qt::GestureStarted) {
                                initialZoom_ = lyxrc.currentZoom;
+                               LYXERR(Debug::GUI, "initialZoom_: " << 
initialZoom_);
                        }
                        if (changeFlags & QPinchGesture::ScaleFactorChanged) {
-                               qreal factor = initialZoom_ * 
pinch->totalScaleFactor();
+                               qreal factor = initialZoom_ * totalScaleFactor;
+                               LYXERR(Debug::GUI, "scaleFactor: " << factor);
                                zoomValueChanged(factor);
                        }
                }
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