fix: resolve module-relative UI paths when loaded from callbacks

modules/corelib/ui/uipathresolver.lua

@@ -0,0 +1,70 @@
+-- Resolves module-relative UI paths in Lua before they reach the C++ layer.
+--
+-- Root cause being worked around: ResourceManager::resolvePath() resolves a
+-- relative path against g_lua.getCurrentSourcePath(), but when the call happens
+-- inside a callback (UI button, protocol packet, scheduled event) that context
+-- can be unavailable — and the isPreDrawing() branch skips it entirely — so
+-- 'file' resolves to '/file.otui' (the root) and the load fails. This breaks
+-- every g_ui.loadUI/displayUI/importStyle('barename') call made from a
+-- callback (imbuing, outfit, console channels, VIP add/edit, shop, stash,
+-- character list, ...), while the same call works from a module's init().
+--
+-- The fix: wrap the three entry points and, when the argument is a relative
+-- path, resolve it against the *calling file's* directory (debug.getinfo),
+-- but only if the target file actually exists there. In every other case the
+-- argument is forwarded untouched, so behavior is identical to before.
+
+local function resolveCallerPath(path)
+    if type(path) ~= 'string' or path == '' or path:sub(1, 1) == '/' then
+        return path
+    end
+
+    -- level 3: 1 = resolveCallerPath, 2 = wrapper, 3 = caller
+    local info = debug.getinfo(3, 'S')
+    local src = info and info.source
+    if not src or src:sub(1, 1) ~= '@' then
+        return path
+    end
+
+    src = src:sub(2)
+    if src:sub(1, 1) ~= '/' then
+        return path
+    end
+
+    local dir = src:match('^(.*)/[^/]*$')
+    if not dir or dir == '' then
+        return path
+    end
+
+    local candidate = dir .. '/' .. path
+    -- mirror g_resources.guessFilePath(candidate, 'otui')
+    local candidateFile = candidate
+    if candidate:sub(-5) ~= '.otui' then
+        candidateFile = candidate .. '.otui'
+    end
+
+    if g_resources.fileExists(candidateFile) then
+        return candidate
+    end
+    return path
+end
+
+if not g_ui.__pathResolverInstalled then
+    g_ui.__pathResolverInstalled = true
+
+    local origLoadUI = g_ui.loadUI
+    local origDisplayUI = g_ui.displayUI
+    local origImportStyle = g_ui.importStyle
+
+    g_ui.loadUI = function(path, ...)
+        return origLoadUI(resolveCallerPath(path), ...)
+    end
+
+    g_ui.displayUI = function(path, ...)
+        return origDisplayUI(resolveCallerPath(path), ...)
+    end
+
+    g_ui.importStyle = function(path, ...)
+        return origImportStyle(resolveCallerPath(path), ...)
+    end
+end