feat: pad suffix of latex so backgrounds are aligned

Author: MeanderingProgrammer

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*         For NVIM v0.11.1        Last change: 2025 May 30
+*render-markdown.txt*         For NVIM v0.11.2        Last change: 2025 May 31
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*

lua/render-markdown/handler/latex.lua

@@ -65,8 +65,12 @@ function Handler:expressions(node)
     for _ = 1, self.config.top_pad do
         result[#result + 1] = ''
     end
-    for _, line in ipairs(self:convert(node.text)) do
-        result[#result + 1] = Str.pad(node.start_col) .. line
+    local lines = Str.split(self:convert(node.text), '\n', true)
+    local width = vim.fn.max(Iter.list.map(lines, Str.width))
+    for _, line in ipairs(lines) do
+        local prefix = Str.pad(node.start_col)
+        local suffix = Str.pad(width - Str.width(line))
+        result[#result + 1] = prefix .. line .. suffix
     end
     for _ = 1, self.config.bottom_pad do
         result[#result + 1] = ''
@@ -76,7 +80,7 @@ end
 
 ---@private
 ---@param text string
----@return string[]
+---@return string
 function Handler:convert(text)
     local result = Handler.cache[text]
     if not result then
@@ -88,7 +92,7 @@ function Handler:convert(text)
         end
         Handler.cache[text] = result
     end
-    return Str.split(result, '\n', true)
+    return result
 end
 
 ---@private

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '8.4.9'
+M.version = '8.4.10'
 
 function M.check()
     M.start('version')

tests/latex_spec.lua

@@ -19,11 +19,12 @@ local function set_responses(converter, responses)
 end
 
 ---@param lines string[]
+---@param width integer
 ---@return vim.api.keyset.set_extmark
-local function latex(lines)
+local function latex(lines, width)
     local virt_lines = vim.iter(lines)
         :map(function(line)
-            return { { line, 'RmMath' } }
+            return { { line .. (' '):rep(width - #line), 'RmMath' } }
         end)
         :totable()
     ---@type vim.api.keyset.set_extmark
@@ -70,8 +71,8 @@ describe('latex.md', function()
         marks:add(row:get(), row:get(), 0, 1, util.heading.icon(1))
         marks:add(row:get(), row:inc(), 0, 0, util.heading.bg(1))
 
-        marks:add(row:inc(), nil, 0, nil, latex(inline.out))
-        marks:add(row:inc(2), nil, 0, nil, latex(block.out))
+        marks:add(row:inc(), nil, 0, nil, latex(inline.out, 17))
+        marks:add(row:inc(2), nil, 0, nil, latex(block.out, 28))
 
         util.assert_view(marks, {
             '󰫎 󰲡 LaTeX',