UI: Add a verbose debug logging checkbox next to "Report a bug"

@hius07 mentioned something to that effect a while back, makes sense.

Unlike the set of checkmarks in the dev settings, this one flips both
debug + verbose at once, *and* asks for a restart for framebuffer's
sake.

Also update the "Report a bug" spiel to request verbose debug logs.

frontend/dbg.lua

@@ -86,6 +86,13 @@ function Dbg:v(...)
     end
 end
 
+--- Conditional logging with a stable ref.
+function Dbg.log(...)
+    if Dbg.is_on then
+        return LvDEBUG(...)
+    end
+end
+
 --- Simple traceback.
 function Dbg:traceback()
     return LvDEBUG(debug.traceback())

frontend/device/kobo/device.lua

@@ -2,10 +2,10 @@ local Generic = require("device/generic/device")
 local Geom = require("ui/geometry")
 local UIManager
 local WakeupMgr = require("device/wakeupmgr")
-local time = require("ui/time")
 local ffiUtil = require("ffi/util")
 local lfs = require("libs/libkoreader-lfs")
 local logger = require("logger")
+local time = require("ui/time")
 local util = require("util")
 local _ = require("gettext")
 

frontend/ui/elements/common_info_menu_table.lua

@@ -3,6 +3,7 @@ local Device = require("device")
 local InfoMessage = require("ui/widget/infomessage")
 local UIManager = require("ui/uimanager")
 local Version = require("version")
+local dbg = require("dbg")
 local lfs = require("libs/libkoreader-lfs")
 local _ = require("gettext")
 local T = require("ffi/util").template
@@ -50,6 +51,29 @@ common_info.about = {
         })
     end
 }
+common_info.debug_logging = {
+    text = _("Enable verbose debug logging"),
+    checked_func = function()
+        return G_reader_settings:isTrue("debug_verbose")
+    end,
+    callback = function()
+        -- Unlike in the dev options, we flip everything at once.
+        if G_reader_settings:isTrue("debug_verbose") then
+            dbg:setVerbose(false)
+            dbg:turnOff()
+            G_reader_settings:makeFalse("debug_verbose")
+            G_reader_settings:makeFalse("debug")
+        else
+            dbg:turnOn()
+            dbg:setVerbose(true)
+            G_reader_settings:makeTrue("debug")
+            G_reader_settings:makeTrue("debug_verbose")
+        end
+        -- Also unlike the dev options, explicitly ask for a restart,
+        -- to make sure framebuffer pulls in a logger.dbg ref that doesn't point to noop on init ;).
+        UIManager:askForRestart()
+    end,
+}
 common_info.report_bug = {
     text = _("Report a bug"),
     keep_menu_open = true,
@@ -58,7 +82,7 @@ common_info.report_bug = {
         local log_path = string.format("%s/%s", DataStorage:getDataDir(), "crash.log")
         local common_msg = T(_("Please report bugs to \nhttps://github.com/koreader/koreader/issues\n\nVersion:\n%1\n\nDetected device:\n%2"),
             Version:getCurrentRevision(), Device:info())
-        local log_msg = T(_("Attach %1 to your bug report."), log_path)
+        local log_msg = T(_("Reproduce the issue with verbose debug logging enabled, and attach %1 to your bug report."), log_path)
 
         if Device:isAndroid() then
             local android = require("android")

frontend/ui/elements/filemanager_menu_order.lua

@@ -182,6 +182,7 @@ local order = {
         "----------------------------",
         "search_menu",
         "----------------------------",
+        "debug_logging",
         "report_bug",
         "----------------------------",
         "system_statistics", -- if enabled (Plugin)

frontend/ui/elements/reader_menu_order.lua

@@ -242,6 +242,7 @@ local order = {
         "----------------------------",
         "search_menu",
         "----------------------------",
+        "debug_logging",
         "report_bug",
         "----------------------------",
         "system_statistics",  -- if enabled (Plugin)