Save and restore window geometry via `QSettings`

Seems to be required to get certain widgets to size correctly on macos
like the order-mode "health bar" among other types of labels?

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

Originally from @dnks with a weird(er) commit msg XP

piker/ui/_window.py

@@ -37,6 +37,7 @@ from piker.ui.qt import (
     QStatusBar,
     QScreen,
     QCloseEvent,
+    QSettings,
 )
 from ..log import get_logger
 from ._style import _font_small, hcolor
@@ -181,6 +182,13 @@ class MainWindow(QMainWindow):
         self._status_label: QLabel = None
         self._size: tuple[int, int]|None = None
 
+        # restore window geometry from previous session
+        settings = QSettings('pikers', 'piker')
+        geometry = settings.value('windowGeometry')
+        if geometry is not None:
+            self.restoreGeometry(geometry)
+            log.debug('Restored window geometry from previous session')
+
     @property
     def mode_label(self) -> QLabel:
 
@@ -217,6 +225,11 @@ class MainWindow(QMainWindow):
         '''Cancel the root actor asap.
 
         '''
+        # save window geometry for next session
+        settings = QSettings('pikers', 'piker')
+        settings.setValue('windowGeometry', self.saveGeometry())
+        log.debug('Saved window geometry for next session')
+
         # raising KBI seems to get intercepted by by Qt so just use the system.
         os.kill(os.getpid(), signal.SIGINT)
 

piker/ui/qt.py

@@ -44,6 +44,7 @@ from PyQt6.QtCore import (
     QItemSelectionModel,
     pyqtBoundSignal,
     pyqtRemoveInputHook,
+    QSettings,
 )
 
 align_flag: EnumType = Qt.AlignmentFlag