[UX] Extend edge zones (#5181)

See: https://github.com/koreader/koreader/pull/5179#discussion_r310676845

frontend/apps/reader/modules/readerfrontlight.lua

@@ -71,14 +71,14 @@ function ReaderFrontLight:onChangeFlIntensity(ges, direction)
     local powerd = Device:getPowerDevice()
     local gestureScale
     if ges.direction == "south" or ges.direction == "north" then
-        gestureScale = Screen:getHeight() * 7/8 * 0.8
+        gestureScale = Screen:getHeight() * 0.8
     elseif ges.direction == "west" or ges.direction == "east" then
-        gestureScale = Screen:getWidth() * 7/8 * 0.8
+        gestureScale = Screen:getWidth() * 0.8
     else
         local width = Screen:getWidth()
         local height = Screen:getHeight()
         -- diagonal
-        gestureScale = math.sqrt(width * width + height * height) * 7/8 * 0.8
+        gestureScale = math.sqrt(width * width + height * height) * 0.8
     end
     if powerd.fl_intensity == nil then return false end
 
@@ -130,14 +130,14 @@ function ReaderFrontLight:onChangeFlWarmth(ges, direction)
 
     local gestureScale
     if ges.direction == "south" or ges.direction == "north" then
-        gestureScale = Screen:getHeight() * 7/8 * 0.8
+        gestureScale = Screen:getHeight() * 0.8
     elseif ges.direction == "west" or ges.direction == "east" then
-        gestureScale = Screen:getWidth() * 7/8 * 0.8
+        gestureScale = Screen:getWidth() * 0.8
     else
         local width = Screen:getWidth()
         local height = Screen:getHeight()
         -- diagonal
-        gestureScale = math.sqrt(width * width + height * height) * 7/8 * 0.8
+        gestureScale = math.sqrt(width * width + height * height) * 0.8
     end
 
     local steps_tbl = {}

frontend/apps/reader/modules/readergesture.lua

@@ -845,25 +845,25 @@ function ReaderGesture:setupGesture(ges, action)
     local direction, distance
 
     local zone_fullscreen = {
-        ratio_x = 0.0, ratio_y = 0,
+        ratio_x = 0, ratio_y = 0,
         ratio_w = 1, ratio_h = 1,
     }
 
     local zone_left_edge = {
-        ratio_x = 0, ratio_y = 1/8,
-        ratio_w = 1/8, ratio_h = 7/8,
+        ratio_x = 0, ratio_y = 0,
+        ratio_w = 1/8, ratio_h = 1,
     }
     local zone_right_edge = {
-        ratio_x = 7/8, ratio_y = 1/8,
-        ratio_w = 1/8, ratio_h = 7/8,
+        ratio_x = 7/8, ratio_y = 0,
+        ratio_w = 1/8, ratio_h = 1,
     }
     local zone_top_edge = {
-        ratio_x = 1/8, ratio_y = 0,
-        ratio_w = 7/8, ratio_h = 1/8,
+        ratio_x = 0, ratio_y = 0,
+        ratio_w = 1, ratio_h = 1/8,
     }
     local zone_bottom_edge = {
-        ratio_x = 1/8, ratio_y = 7/8,
-        ratio_w = 7/8, ratio_h = 1/8,
+        ratio_x = 0, ratio_y = 7/8,
+        ratio_w = 1, ratio_h = 1/8,
     }
 
     -- legacy global variable DTAP_ZONE_FLIPPING may still be defined in default.persistent.lua