Chore: Make sure we always pass a rect to `fb:refreshFull` (#11307)

* UIManager: Init a full Geom on region-less refreshes in _refresh
* Never call refreshFull with no arguments
  I got rid of the low-level nil guards, because UIManager itself guarantees that it can never happen
* Bump base (https://github.com/koreader/koreader-base/pull/1718) (fix #11303)
* Kindle: Re-enable HW dithering on the Scribe
  Now that the underlying issue is fixed in base ;).

base

@@ -1 +1 @@
-Subproject commit d83148b27e25b9332678221f6737d66be7e73318
+Subproject commit 5f9b9b6f89d6865ba0247adc09aecaa593c9e03f

frontend/device/generic/device.lua

@@ -326,7 +326,7 @@ function Device:onPowerEvent(ev)
                 self:resume()
                 local widget_was_closed = Screensaver:close()
                 if widget_was_closed and self:needsScreenRefreshAfterResume() then
-                    UIManager:scheduleIn(1, function() self.screen:refreshFull() end)
+                    UIManager:scheduleIn(1, function() self.screen:refreshFull(0, 0, self.screen:getWidth(), self.screen:getHeight()) end)
                 end
                 self.powerd:afterResume()
             end
@@ -371,7 +371,7 @@ function Device:onPowerEvent(ev)
         --       and on platforms where we defer to a system tool, it'd probably suspend too early!
         --       c.f., #6676
         if self:needsScreenRefreshAfterResume() then
-            self.screen:refreshFull()
+            self.screen:refreshFull(0, 0, self.screen:getWidth(), self.screen:getHeight())
         end
         -- NOTE: In the same vein as above, make sure we update the screen *now*, before dealing with Wi-Fi.
         UIManager:forceRePaint()

frontend/device/kindle/device.lua

@@ -639,7 +639,7 @@ local KindleScribe = Kindle:extend{
     hasGSensor = yes,
     display_dpi = 300,
     touch_dev = "/dev/input/touch",
-    canHWDither = no,
+    canHWDither = yes,
     canDoSwipeAnimation = yes,
 }
 

frontend/ui/screensaver.lua

@@ -529,7 +529,7 @@ function Screensaver:show()
             if self:withBackground() then
                 Screen:clear()
             end
-            Screen:refreshFull()
+            Screen:refreshFull(0, 0, Screen:getWidth(), Screen:getHeight())
 
             -- On Kobo, on sunxi SoCs with a recent kernel, wait a tiny bit more to avoid weird refresh glitches...
             if Device:isKobo() and Device:isSunxi() then

frontend/ui/uimanager.lua

@@ -1170,7 +1170,7 @@ function UIManager:_refresh(mode, region, dither)
     end
 
     -- if no region is specified, use the screen's dimensions
-    region = region or Geom:new{w=Screen:getWidth(), h=Screen:getHeight()}
+    region = region or Geom:new{x = 0, y = 0, w = Screen:getWidth(), h = Screen:getHeight()}
 
     -- if no dithering hint was specified, don't request dithering
     dither = dither or false