ReaderUI: Properly neuter gesture handling from InputContainer modules

None[1] of them actually rely on their own onGesture handler, they
all register their own stuff to ReaderUI's.
Hotfix #9710 revealed that the way this was handled didn't exactly
work as expected ;).

The only thing that consumes ges_events is InputContainer's onGesture
method. All these modules *extend* InputContainer, but none of them
*implement* a custom onGesture, so self.onGesture = nil was just a NOP,
they always access InputContainer's method via inheritance.
If we actively want to neuter it, we *have* to implement it in that
module (with a NOP).

[1] The exception being ReaderZooming, but that only when in flip mode.

frontend/apps/reader/modules/readerbookmark.lua

@@ -56,8 +56,12 @@ function ReaderBookmark:init()
     end
 
     self.ui.menu:registerToMainMenu(self)
+    -- NOP our own gesture handling
+    self.ges_events = nil
 end
 
+function ReaderBookmark:onGesture() end
+
 function ReaderBookmark:addToMainMenu(menu_items)
     menu_items.bookmarks = {
         text = _("Bookmarks"),

frontend/apps/reader/modules/readerconfig.lua

@@ -28,8 +28,13 @@ function ReaderConfig:init()
     else
         self.activation_menu = "swipe_tap"
     end
+
+    -- delegate gesture listener to ReaderUI, NOP our own
+    self.ges_events = nil
 end
 
+function ReaderConfig:onGesture() end
+
 function ReaderConfig:initGesListener()
     if not Device:isTouchDevice() then return end
 

frontend/apps/reader/modules/readerfont.lua

@@ -126,8 +126,13 @@ function ReaderFont:init()
         return self.font_face
     end
     self.ui.menu:registerToMainMenu(self)
+
+    -- NOP our own gesture handling
+    self.ges_events = nil
 end
 
+function ReaderFont:onGesture() end
+
 function ReaderFont:onSetDimensions(dimen)
     self.dimen = dimen
 end

frontend/apps/reader/modules/readerhighlight.lua

@@ -230,13 +230,14 @@ function ReaderHighlight:init()
     self.ui:registerPostInitCallback(function()
         self.ui.menu:registerToMainMenu(self)
     end)
+
+    -- delegate gesture listener to readerui, NOP our own
+    self.ges_events = nil
 end
 
-function ReaderHighlight:setupTouchZones()
-    -- delegate gesture listener to readerui
-    self.ges_events = {}
-    self.onGesture = nil
+function ReaderHighlight:onGesture() end
 
+function ReaderHighlight:setupTouchZones()
     if not Device:isTouchDevice() then return end
     local hold_pan_rate = G_reader_settings:readSetting("hold_pan_rate")
     if not hold_pan_rate then

frontend/apps/reader/modules/readerlink.lua

@@ -106,8 +106,13 @@ function ReaderLink:init()
         G_reader_settings:saveSetting("swipe_link_footnote_popup", nil)
         G_reader_settings:saveSetting("footnote_link_in_popup", true)
     end
+
+    -- delegate gesture listener to readerui, NOP our own
+    self.ges_events = nil
 end
 
+function ReaderLink:onGesture() end
+
 function ReaderLink:onReadSettings(config)
     -- called when loading new document
     self.location_stack = {}

frontend/apps/reader/modules/readermenu.lua

@@ -76,16 +76,18 @@ function ReaderMenu:init()
     else
         self.activation_menu = "swipe_tap"
     end
+
+    -- delegate gesture listener to readerui, NOP our own
+    self.ges_events = nil
 end
 
+function ReaderMenu:onGesture() end
+
 function ReaderMenu:getPreviousFile()
     return require("readhistory"):getPreviousFile(self.ui.document.file)
 end
 
 function ReaderMenu:onReaderReady()
-    -- delegate gesture listener to readerui
-    self.ges_events = {}
-    self.onGesture = nil
     if not Device:isTouchDevice() then return end
 
     local DTAP_ZONE_MENU = G_defaults:readSetting("DTAP_ZONE_MENU")

frontend/apps/reader/modules/readerpaging.lua

@@ -118,16 +118,18 @@ function ReaderPaging:init()
     end
     self.pan_interval = time.s(1 / self.pan_rate)
     self.number_of_pages = self.ui.document.info.number_of_pages
+
+    -- delegate gesture listener to readerui, NOP our own
+    self.ges_events = nil
 end
 
+function ReaderPaging:onGesture() end
+
 function ReaderPaging:onReaderReady()
     self:setupTouchZones()
 end
 
 function ReaderPaging:setupTouchZones()
-    -- delegate gesture listener to readerui
-    self.ges_events = {}
-    self.onGesture = nil
     if not Device:isTouchDevice() then return end
 
     local forward_zone, backward_zone = self.view:getTapZones()

frontend/apps/reader/modules/readerpanning.lua

@@ -38,8 +38,12 @@ function ReaderPanning:init()
             },
         }
     end
+    -- NOP our own gesture handling
+    self.ges_events = nil
 end
 
+function ReaderPanning:onGesture() end
+
 function ReaderPanning:onSetDimensions(dimensions)
     self.dimen = dimensions
 end

frontend/apps/reader/modules/readerrolling.lua

@@ -148,8 +148,13 @@ function ReaderRolling:init()
     end)
     self.ui.menu:registerToMainMenu(self)
     self.batched_update_count = 0
+
+    -- delegate gesture listener to readerui, NOP our own
+    self.ges_events = nil
 end
 
+function ReaderRolling:onGesture() end
+
 function ReaderRolling:onReadSettings(config)
     -- 20180503: some fix in crengine has changed the way the DOM is built
     -- for HTML documents and may make XPATHs obtained from previous version
@@ -331,9 +336,6 @@ function ReaderRolling:onReaderReady()
 end
 
 function ReaderRolling:setupTouchZones()
-    -- delegate gesture listener to readerui
-    self.ges_events = {}
-    self.onGesture = nil
     if not Device:isTouchDevice() then return end
 
     local forward_zone, backward_zone = self.view:getTapZones()

frontend/apps/reader/modules/readerrotation.lua

@@ -23,8 +23,12 @@ function ReaderRotation:init()
             },
         }
     end
+    -- NOP our own gesture handling
+    self.ges_events = nil
 end
 
+function ReaderRotation:onGesture() end
+
 --- @todo Reset rotation on new document, maybe on new page?
 
 function ReaderRotation:onRotate(rotate_by)

frontend/apps/reader/modules/readertoc.lua

@@ -55,8 +55,13 @@ function ReaderToc:init()
 
     self:resetToc()
     self.ui.menu:registerToMainMenu(self)
+
+    -- NOP our own gesture handling
+    self.ges_events = nil
 end
 
+function ReaderToc:onGesture() end
+
 function ReaderToc:onReadSettings(config)
     self.toc_ticks_ignored_levels = config:readSetting("toc_ticks_ignored_levels") or {}
     self.toc_chapter_navigation_bind_to_ticks = config:readSetting("toc_chapter_navigation_bind_to_ticks")