Fixed Z-Timelapse for Z changes on `G1` moves

Solves #909

CHANGELOG.md

@@ -183,6 +183,7 @@
   * [#809](https://github.com/foosel/OctoPrint/issues/809) - Added proper form validation to printer profile editor
   * [#824](https://github.com/foosel/OctoPrint/issues/824) - Settings getting lost when switching between panes in
     the settings dialog (fix provided by [#879](https://github.com/foosel/OctoPrint/pull/879))
+  * [#909](https://github.com/foosel/OctoPrint/issues/909) - Fixed Z-Timelapse for Z changes on ``G1`` moves.
 * Various fixes without tickets:
   * GCODE viewer now doesn't stumble over completely extrusionless GCODE files
   * Do not deliver the API key on settings API unless user has admin rights

src/octoprint/timelapse.py

@@ -349,7 +349,7 @@ class ZTimelapse(Timelapse):
 
 	def eventSubscriptions(self):
 		return [
-			("ZChange", self._onZChange)
+			(Events.Z_CHANGE, self._onZChange)
 		]
 
 	def configData(self):

src/octoprint/util/comm.py

@@ -1612,7 +1612,7 @@ class MachineCom(object):
 				except ValueError:
 					pass
 		return cmd
-	_gcode_G0_sent = _gcode_G0_sent
+	_gcode_G1_sent = _gcode_G0_sent
 
 	def _gcode_M0_queue(self, cmd):
 		self.setPause(True)