Kobo: Unbreak input translation when a viewport is active

Generic is responsible for setting up the translation via input hooks;
since our own input hooks involve swapping or mirroring X/Y, we need to
run our own hooks *first*, so that the viewport translation actually
does the right thing...

Probably broken for a good long while, I'd just assumed the inaccuracies
on the H2O were due to the IR grid... :/.

Reported @ https://www.mobileread.com/forums/showthread.php?t=351340

frontend/device/generic/device.lua

@@ -197,6 +197,9 @@ function Device:init()
         self.powerd = require("device/generic/powerd"):new{device = self}
     end
 
+    -- NOTE: This needs to run *after* implementation-specific event hooks,
+    --       especially if those require swapping/mirroring...
+    --       (e.g., Device implementations should setup their own hooks *before* calling this via Generic.init(self)).
     if self.viewport then
         logger.dbg("setting a viewport:", self.viewport)
         self.screen:setViewport(self.viewport)

frontend/device/kobo/device.lua

@@ -752,7 +752,13 @@ function Kobo:init()
         dodgy_rtc = dodgy_rtc,
     }
 
+    -- Input handling on Kobo is a thing of nightmares, start by setting up the actual evdev handler...
+    self:setTouchEventHandler()
+    -- And then handle the extra shenanigans if necessary.
+    self:initEventAdjustHooks()
+
     -- Let generic properly setup the standard stuff
+    -- (*after* we've set our input hooks, so that the viewport translation runs last).
     Generic.init(self)
 
     -- Various HW Buttons, Switches & Synthetic NTX events
@@ -771,11 +777,6 @@ function Kobo:init()
     -- NOTE: usb hotplug event is also available in /tmp/nickel-hardware-status (... but only when Nickel is running ;p)
     self.input.open("fake_events")
 
-    -- Input handling on Kobo is a thing of nightmares, start by setting up the actual evdev handler...
-    self:setTouchEventHandler()
-    -- And then handle the extra shenanigans if necessary.
-    self:initEventAdjustHooks()
-
     -- See if the device supports key repeat
     if not self:getKeyRepeat() then
         -- NOP unsupported methods