fix(vim.version): vim.VersionRange:has(<prerelease>) (#33324)

Problem:
`vim.version.range('>=0.10'):has('0.12.0-dev')` returns false, which is
wrong per semver.

Solution:
`vim.VersionRange:has()` shouldn't have special handling for prereleases
(Why would we need it when `__eq`, `__lt`, `__le` already handle
 prereleases?).

Closes #33316

runtime/doc/news.txt

@@ -179,6 +179,7 @@ These existing features changed their behavior.
 
 • 'spellfile' location defaults to `stdpath("data").."/spell/"` instead of the
   first writable directoy in 'runtimepath'.
+• |vim.version.range()| doesn't exclude `to` if it is equal to `from`.
 
 ==============================================================================
 REMOVED FEATURES                                                 *news-removed*

runtime/lua/vim/version.lua

@@ -238,8 +238,8 @@ function VersionRange:has(version)
     version = setmetatable(vim.deepcopy(version, true), Version)
   end
   if version then
-    if version.prerelease ~= self.from.prerelease then
-      return false
+    if self.from == self.to then
+      return version == self.from
     end
     return version >= self.from and (self.to == nil or version < self.to)
   end
@@ -310,9 +310,7 @@ function M.range(spec) -- Adapted from https://github.com/folke/lazy.nvim
     local from = semver --- @type vim.Version?
     local to = vim.deepcopy(semver, true) --- @type vim.Version?
     ---@diagnostic disable: need-check-nil
-    if mods == '' or mods == '=' then
-      to.patch = to.patch + 1
-    elseif mods == '<' then
+    if mods == '<' then
       from = M._version({})
     elseif mods == '<=' then
       from = M._version({})

test/functional/lua/version_spec.lua

@@ -55,9 +55,9 @@ describe('version', function()
 
   describe('range', function()
     local tests = {
-      ['1.2.3'] = { from = { 1, 2, 3 }, to = { 1, 2, 4 } },
+      ['1.2.3'] = { from = { 1, 2, 3 }, to = { 1, 2, 3 } },
       ['1.2'] = { from = { 1, 2, 0 }, to = { 1, 3, 0 } },
-      ['=1.2.3'] = { from = { 1, 2, 3 }, to = { 1, 2, 4 } },
+      ['=1.2.3'] = { from = { 1, 2, 3 }, to = { 1, 2, 3 } },
       ['>1.2.3'] = { from = { 1, 2, 4 } },
       ['>=1.2.3'] = { from = { 1, 2, 3 } },
       ['<1.2.3'] = { from = { 0, 0, 0 }, to = { 1, 2, 3 } },
@@ -100,17 +100,25 @@ describe('version', function()
       end)
 
       it('[to] not in range ' .. input .. ' to:' .. tostring(range.to), function()
-        if range.to then
+        if range.to and range.to ~= range.from then
           assert(not (range.to < range.to))
           assert(not range:has(range.to))
         end
       end)
+
+      it('[to] in range ' .. input .. ' to:' .. tostring(range.to), function()
+        if range.to and range.to == range.from then
+          assert(range:has(range.to))
+        end
+      end)
     end
 
     it('handles prerelease', function()
       assert(not vim.version.range('1.2.3'):has('1.2.3-alpha'))
       assert(vim.version.range('1.2.3-alpha'):has('1.2.3-alpha'))
       assert(not vim.version.range('1.2.3-alpha'):has('1.2.3-beta'))
+      assert(vim.version.range('>0.10'):has('0.12.0-dev'))
+      assert(not vim.version.range('>=0.12'):has('0.12.0-dev'))
     end)
 
     it('returns nil with empty version', function()
@@ -138,6 +146,7 @@ describe('version', function()
       { v1 = '1.0.0-2.0', v2 = '1.0.0-2', want = 1 },
       { v1 = '1.0.0-2.0', v2 = '1.0.0-2.0', want = 0 },
       { v1 = '1.0.0-alpha', v2 = '1.0.0-alpha', want = 0 },
+      -- Per semver spec, prereleases have alphabetical ordering.
       { v1 = '1.0.0-alpha', v2 = '1.0.0-beta', want = -1 },
       { v1 = '1.0.0-beta', v2 = '1.0.0-alpha', want = 1 },
       { v1 = '1.0.0-alpha', v2 = '1.0.0-alpha.1', want = -1 },