feat: improve wiki link rendering

## Details

Discussion: #284

Wiki links are rendered using a single extmark which conceals all
content and then adds inline text as an overlay. This works but means
that any other styles such as a strike through are removed.

To improve this handle each component of the wiki link separately,
similarly to the way autolinks are handled. This means we:

- Hide the opening bracket
- Inline the icon
- Hide the link destination if an alias exists
- Hide the closing bracket

As 4 separate individual marks. This means the contents of the alias &
destination will keep the style they had before rendering.

Author: MeanderingProgrammer

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*          For 0.10.0         Last change: 2025 January 04
+*render-markdown.txt*          For 0.10.0         Last change: 2025 January 06
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '7.8.0'
+M.version = '7.8.1'
 
 function M.check()
     M.start('version')

lua/render-markdown/render/shortcut.lua

@@ -98,13 +98,37 @@ function Render:wiki_link()
         return
     end
 
-    local parts = Str.split(self.node.text:sub(2, -2), '|')
-    local icon, highlight = self:from_destination(self.link.wiki.icon, self.link.wiki.highlight, parts[1])
+    local wiki = self.link.wiki
+    local start_col, end_col = self.node.start_col, self.node.end_col
+    local values = Str.split(self.node.text:sub(2, -2), '|')
+
+    -- Hide opening outer bracket
+    self:hide(start_col - 1, start_col)
+
+    -- Add icon
+    local icon, highlight = self:from_destination(wiki.icon, wiki.highlight, values[1])
     self.marks:add_over('link', self.node, {
-        virt_text = { { icon .. parts[#parts], highlight } },
+        virt_text = { { icon, highlight } },
         virt_text_pos = 'inline',
+    })
+
+    -- Hide destination if there is an alias
+    if #values > 1 then
+        self:hide(start_col + 1, start_col + 1 + #values[1] + 1)
+    end
+
+    -- Hide closing outer bracket
+    self:hide(end_col, end_col + 1)
+end
+
+---@private
+---@param start_col integer
+---@param end_col integer
+function Render:hide(start_col, end_col)
+    self.marks:add(true, self.node.start_row, start_col, {
+        end_col = end_col,
         conceal = '',
-    }, { 0, -1, 0, 1 })
+    })
 end
 
 ---@private

tests/ad_hoc_spec.lua

@@ -47,20 +47,6 @@ local function link(row, start_col, end_col, text, highlight, conceal)
     }
 end
 
----@param row integer
----@param start_col integer
----@param end_col integer
----@param icon string
----@return render.md.MarkInfo[]
-local function auto_link(row, start_col, end_col, icon)
-    return {
-        util.conceal(row, start_col, start_col + 1),
-        link(row, start_col, end_col, icon, 'Link', nil),
-        util.highlight(row, start_col, end_col, 'Link'),
-        util.conceal(row, end_col - 1, end_col),
-    }
-end
-
 describe('ad_hoc.md', function()
     it('custom', function()
         util.setup('tests/data/ad_hoc.md')
@@ -75,22 +61,33 @@ describe('ad_hoc.md', function()
 
         vim.list_extend(expected, {
             util.bullet(row:increment(), 0, 1),
-            link(row:get(), 2, 15, '󱗖 Basic One', 'WikiLink', ''),
+            util.conceal(row:get(), 2, 3),
+            link(row:get(), 3, 14, '󱗖 ', 'WikiLink', nil),
+            util.conceal(row:get(), 14, 15),
         })
 
         vim.list_extend(expected, {
             util.bullet(row:increment(), 0, 1),
-            link(row:get(), 2, 25, '󱗖 With Alias', 'WikiLink', ''),
+            util.conceal(row:get(), 2, 3),
+            link(row:get(), 3, 24, '󱗖 ', 'WikiLink', nil),
+            util.conceal(row:get(), 4, 13),
+            util.conceal(row:get(), 24, 25),
         })
 
         vim.list_extend(expected, {
             util.bullet(row:increment(), 0, 1),
-            auto_link(row:get(), 2, 20, '󰀓 '),
+            util.conceal(row:get(), 2, 3),
+            link(row:get(), 2, 20, '󰀓 ', 'Link', nil),
+            util.highlight(row:get(), 2, 20, 'Link'),
+            util.conceal(row:get(), 19, 20),
         })
 
         vim.list_extend(expected, {
             util.bullet(row:increment(), 0, 1),
-            auto_link(row:get(), 2, 26, '󰊤 '),
+            util.conceal(row:get(), 2, 3),
+            link(row:get(), 2, 26, '󰊤 ', 'Link', nil),
+            util.highlight(row:get(), 2, 26, 'Link'),
+            util.conceal(row:get(), 25, 26),
         })
 
         vim.list_extend(expected, {