try to stick to the same scaling value longer

xpra/server/window/window_video_source.py

@@ -1633,11 +1633,13 @@ def mrs(v=(1, 1), info="using minimum required scaling"):
                     ratio = target/spps
                     #ideal ratio is 1, measure distance from 1:
                     score = int(abs(1-ratio)*100)
-                    if self.actual_scaling and self.actual_scaling==(num, denom) and (num!=1 or denom!=1):
-                        #if we are already downscaling,
-                        #try to stick to the same value longer:
-                        #give it a score boost (lowest score wins):
-                        score = int(score/1.5)
+                    if self.actual_scaling == (num, denom):
+                        # try to stick to the same settings longer:
+                        # give it a score boost (lowest score wins):
+                        elapsed = min(16, max(0, now - self.last_pipeline_time))
+                        # gain will range from 4 (after 0 seconds) to 1 (after 9 seconds)
+                        gain = sqrt(17 - elapsed)
+                        score = round(score / gain)
                     if num/denom>min_ratio:
                         #higher than minimum, should not be used unless we have no choice:
                         score = int(score*100)