Hide Latest Visited Folder Indicator Patch for KOReader Mosaic View

2-hide-latest-visited.lua

--[[
Hide Latest Visited Folder Indicator Patch for KOReader
========================================================

This patch removes the horizontal bar (underline) under the "latest visited" 
folder in the mosaic view of KOReader's file browser.

**Features:**
- Disables the focus indicator (underline) for all folders in mosaic view
- Maintains compatibility with existing MosaicMenuItem functionality
- Clean, lightweight implementation with minimal overhead

**Installation:**
Place this file in `koreader/patches/` and restart KOReader.

**Author:** Eban
**License:** Same as KOReader (AGPL v3)
]]

-- Prevent double-loading
if rawget(_G, "HideLatestVisitedPatchApplied") then return end
_G.HideLatestVisitedPatchApplied = true

------------------------------------------------------------
-- MOSAIC MENU PATCHING
------------------------------------------------------------
local original_require = require
function require(module_name)
    local result = original_require(module_name)
    
    if module_name == "mosaicmenu" and type(result) == "table" then 
        local success, Blitbuffer = pcall(require, "ffi/blitbuffer")
        if not success then return result end
        
        if result._updateItemsBuildUI then
            local original_updateItemsBuildUI = result._updateItemsBuildUI
            
            result._updateItemsBuildUI = function(self)
                local select_number = original_updateItemsBuildUI(self)
                
                local function patch_items(group)
                    if type(group) ~= "table" then return end
                    
                    for _, item in ipairs(group) do
                        if type(item) == "table" then
                            if item.onFocus and item.onUnfocus and item._underline_container then
                                item.onFocus = function(self)
                                    if self._underline_container then
                                        self._underline_container.color = Blitbuffer.COLOR_WHITE
                                    end
                                    return true
                                end
                                
                                item.onUnfocus = function(self)
                                    if self._underline_container then
                                        self._underline_container.color = Blitbuffer.COLOR_WHITE
                                    end
                                    return true
                                end
                            end
                            
                            patch_items(item)
                        end
                    end
                end
                
                if self.item_group then
                    patch_items(self.item_group)
                end
                
                return select_number
            end
        end
    end
    
    return result 
end

I've rewritten your patch to use KOReader's userpatch tools. Please check here.

It's way much simpler, about ⅕ of the original code, and it works well alongside other patches that need access to the CoverBrowser plugin, instead of causing them to crash.