Some minor fixes, add qApp info, and a PNG app icon

nw/gui/elements/doctree.py

@@ -31,7 +31,7 @@ import nw
 from PyQt5.QtCore import Qt, QSize
 from PyQt5.QtGui import QFont, QColor
 from PyQt5.QtWidgets import (
-    QTreeWidget, QTreeWidgetItem, QAbstractItemView, QApplication, QMessageBox
+    qApp, QTreeWidget, QTreeWidgetItem, QAbstractItemView, QMessageBox
 )
 
 from nw.core import NWDoc
@@ -207,7 +207,7 @@ class GuiDocTree(QTreeWidget):
         """Move an item up or down in the tree, but only if the treeView
         has focus. This also applies when the menu is used.
         """
-        if QApplication.focusWidget() == self and self.theParent.hasProject:
+        if qApp.focusWidget() == self and self.theParent.hasProject:
             tHandle = self.getSelectedHandle()
             tItem   = self._getTreeItem(tHandle)
             pItem   = tItem.parent()

nw/gui/elements/searchbar.py

@@ -30,7 +30,7 @@ import nw
 
 from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import (
-    QFrame, QGridLayout, QLabel, QLineEdit, QPushButton, QApplication
+    qApp, QFrame, QGridLayout, QLabel, QLineEdit, QPushButton
 )
 
 from nw.constants import nwDocAction
@@ -127,7 +127,7 @@ class GuiSearchBar(QFrame):
         return
 
     def _doSearch(self):
-        modKey = QApplication.keyboardModifiers()
+        modKey = qApp.keyboardModifiers()
         if modKey == Qt.ShiftModifier:
             self.theParent.docEditor.docAction(nwDocAction.GO_PREV)
         else: