Window: remember size

GSettings now stores two schemas that'll remember the window width and
height.

Closes #634

data/com.github.maoschanz.drawing.gschema.xml

@@ -89,10 +89,20 @@
     </key>
 
     <!-- Remembered state of the window -->
+    <key type="i" name="window-width">
+      <default>1000</default>
+      <summary>Width of the window</summary>
+      <description>The width of the last closed window.</description>
+    </key>
+    <key type="i" name="window-height">
+      <default>600</default>
+      <summary>Height of the window</summary>
+      <description>The height of the last closed window.</description>
+    </key>
     <key type="b" name="maximized">
       <default>false</default>
-      <summary>State of the window</summary>
-      <description>The state of the last closed window.</description>
+      <summary>Maximization of the window</summary>
+      <description>The maximization state of the last closed window.</description>
     </key>
     <key type="b" name="show-labels">
       <default>false</default>

src/window.py

@@ -72,6 +72,7 @@ def __init__(self, **kwargs):
 		self.devel_mode = False
 		self.should_track_framerate = False
 
+		self.resize(self.gsettings.get_int("window-width"), self.gsettings.get_int("window-height"))
 		if self.gsettings.get_boolean('maximized'):
 			self.maximize()
 
@@ -384,6 +385,8 @@ def on_close(self, *args):
 		self._decorations.remove_from_ui()
 		self.options_manager.persist_tools_options()
 		self.gsettings.set_string('last-active-tool', self.active_tool_id)
+		self.gsettings.set_int("window-width", self.get_size().width)
+		self.gsettings.set_int("window-height", self.get_size().height)
 		self.gsettings.set_boolean('maximized', self.is_maximized())
 		return False