Fix Gem tooltips crashing on Linux

spec/System/TestStatDescriber_spec.lua

@@ -0,0 +1,43 @@
+describe("StatDescriber getScope scenarios", function()
+	before_each(function()
+		newBuild()
+	end)
+
+	teardown(function()
+		-- newBuild() resets environment in setup()
+	end)
+
+	local cases = {
+		{ name = "should_load_lowercase_prefixed_herald_scope", scope = "specific_skill_stat_descriptions/herald_of_thunder_statset_1", stats = {}, shouldSucceed = true, expectedOutputLines = 0 },
+		{ name = "should_load_herald_scope_without_prefix", scope = "herald_of_thunder_statset_1", stats = {}, shouldSucceed = true, expectedOutputLines = 0 },
+		{ name = "should_load_alchemist_boon_scope", scope = "alchemist_boon", stats = {}, shouldSucceed = true, expectedOutputLines = 0 },
+		{ name = "should_load_skill_stat_descriptions", scope = "skill_stat_descriptions", stats = {}, shouldSucceed = true, expectedOutputLines = 0 },
+		{ name = "should_generate_output_for_life_stat", scope = "stat_descriptions", stats = { base_maximum_life = 50 }, shouldSucceed = true, expectedOutputLines = 1 },
+		{ name = "should_generate_output_for_alchemist_boon_flask_recovery", scope = "alchemist_boon", stats = { ["recovery_from_flasks_applies_to_allies_in_presence_%"] = 30 }, shouldSucceed = true, expectedOutputLines = 1 },
+		{ name = "should_generate_output_for_fireball_area_radius", scope = "fireball", stats = { active_skill_base_area_of_effect_radius = 15 }, shouldSucceed = true, expectedOutputLines = 1 },
+		{ name = "should_fail_for_nonexistent_scope", scope = "definitely_nonexistent_scope_12345", stats = {}, shouldSucceed = false },
+		{ name = "should_fail_for_nonexistent_prefixed_scope", scope = "specific_skill_stat_descriptions/definitely_nonexistent_scope_12345", stats = {}, shouldSucceed = false },
+	}
+
+	for _, case in ipairs(cases) do
+		it(case.name, function()
+			ConPrintf("[StatDescriber getScope] %s", case.name)
+			local describe = require("Modules/StatDescriber")
+
+			if case.shouldSucceed then
+				local out, lineMap = describe(case.stats, case.scope)
+				assert.are.equal("table", type(out))
+				assert.are.equal("table", type(lineMap))
+				if case.expectedOutputLines then
+					assert.are.equal(case.expectedOutputLines, #out)
+				end
+			else
+				local ok, err = pcall(function()
+					describe(case.stats, case.scope)
+				end)
+				assert.False(ok)
+				assert.is_string(err)
+			end
+		end)
+	end
+end)

src/Modules/StatDescriber.lua

@@ -13,12 +13,15 @@ local scopes = { }
 local function getScope(scopeName)
 	if not scopes[scopeName] then
 		local scope = nil
-		local file = io.open("Data/StatDescriptions/specific_skill_stat_descriptions/"..scopeName..".lua", 'rb')
+		-- Allow lowercase "specific_skill_stat_descriptions/<name>" by stripping the prefix (Linux is case-sensitive).
+		local normalizedScopeName = scopeName:gsub("^specific_skill_stat_descriptions/", "")
+
+		local file = io.open("Data/StatDescriptions/Specific_Skill_Stat_Descriptions/"..normalizedScopeName..".lua", 'rb')
 		if file then
-			file.close()
-			scope = LoadModule("Data/StatDescriptions/Specific_Skill_Stat_Descriptions/"..scopeName)
+			file:close()
+			scope = LoadModule("Data/StatDescriptions/Specific_Skill_Stat_Descriptions/"..normalizedScopeName)
 		else
-			scope = LoadModule("Data/StatDescriptions/"..scopeName)
+			scope = LoadModule("Data/StatDescriptions/"..normalizedScopeName)
 		end 
 		scope.name = scopeName
 		if scope.parent then