Results, tools: Fix negative timestamp on Windows and some others fixes.

src/View/Results/PlotH.py

@@ -148,7 +148,7 @@ class PlotH(PamhyrPlot):
     def set_reach(self, reach_id):
         self._current_reach_id = reach_id
         self._current_profile_id = 0
-        self.update()
+        self.draw()
 
     def set_profile(self, profile_id):
         self._current_profile_id = profile_id

src/View/Results/PlotKPC.py

@@ -348,6 +348,7 @@ class PlotKPC(PamhyrPlot):
         if not self._init:
             self.draw()
 
+        reach = self.results.river.reach(self._current_reach_id)
         if reach.has_sediment():
             self.update_bottom_with_bedload()
 

src/tools.py

@@ -254,6 +254,11 @@ def old_pamhyr_date_to_timestamp(date: str):
 def timestamp_to_old_pamhyr_date(time: int):
     logger.debug(f"timestamp_to_old_pamhyr_date({time}: {type(time)})")
     t0 = datetime.fromtimestamp(0)
+
+    # HACK: Windows do not accept negative timestamps
+    if time < 0:
+        t = t0 + timedelta(seconds=int(time))
+    else:
         t = datetime.fromtimestamp(int(time))
 
     dt = t - t0