fix: key navigation of markers. fixes #800 (#801)

debug.sh

@@ -1,3 +1,11 @@
-#!/bin/sh
-export PYTHONPATH="src"
-python3 -Xfrozen_modules=off -m debugpy --listen 5678 --wait-for-client "$@"
+#!/bin/bash
+# export PYTHONPATH="src"
+export SRC=$(dirname $(realpath $0))/src
+uv run python -Xfrozen_modules=off -m debugpy --listen 5678 --wait-for-client -c "
+import sys
+
+sys.path.insert(0, \"$SRC\")
+
+import NanoVNASaver.__main__
+NanoVNASaver.__main__.main()
+"

src/NanoVNASaver/Charts/Frequency.py

@@ -806,6 +806,7 @@ def copy(self):
         return new_chart
 
     def keyPressEvent(self, a0: QtGui.QKeyEvent) -> None:
+        logger.debug("Key pressed: %s", a0.key())
         m = self.getActiveMarker()
         if m is not None and a0.modifiers() == Qt.KeyboardModifier.NoModifier:
             if a0.key() in [Qt.Key.Key_Down, Qt.Key.Key_Left]:

src/NanoVNASaver/Marker/Widget.py

@@ -59,6 +59,7 @@
 
 class MarkerFrequencyInputWidget(FrequencyInputWidget):
     def keyPressEvent(self, a0: QtGui.QKeyEvent) -> None:
+        logger.debug(f"keyPressEvent: {a0.key()}")
         if a0.type() == QtGui.QKeyEvent.Type.KeyPress:
             if a0.key() == QtCore.Qt.Key.Key_Up and self.nextFrequency != -1:
                 a0.accept()
@@ -113,7 +114,7 @@ def __init__(
         if not self.name:
             self.name = f"Marker {Marker._instances}"
 
-        self.frequencyInput = FrequencyInputWidget()
+        self.frequencyInput = MarkerFrequencyInputWidget()
         self.frequencyInput.setMinimumHeight(20)
         self.frequencyInput.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight)
         self.frequencyInput.editingFinished.connect(