update linear and vertical in color scheme

Fix #912
Remove "style/horizontal" and "style/vertical"

Author: LEOYoon-Tsaw

sources/SquirrelConfig.swift

@@ -113,34 +113,6 @@ final class SquirrelConfig {
     rimeAPI.config_end(&iterator)
     return appOptions
   }
-
-  // isLinear
-  func updateCandidateListLayout(prefix: String) -> Bool {
-    let candidateListLayout = getString("\(prefix)/candidate_list_layout")
-    switch candidateListLayout {
-    case "stacked":
-      return false
-    case "linear":
-      return true
-    default:
-      // Deprecated. Not to be confused with text_orientation: horizontal
-      return getBool("\(prefix)/horizontal") ?? false
-    }
-  }
-
-  // isVertical
-  func updateTextOrientation(prefix: String) -> Bool {
-    let textOrientation = getString("\(prefix)/text_orientation")
-    switch textOrientation {
-    case "horizontal":
-      return false
-    case "vertical":
-      return true
-    default:
-      // Deprecated.
-      return getBool("\(prefix)/vertical") ?? false
-    }
-  }
 }
 
 private extension SquirrelConfig {

sources/SquirrelTheme.swift

@@ -166,8 +166,8 @@ final class SquirrelTheme {
   }
 
   func load(config: SquirrelConfig, dark: Bool) {
-    linear = config.updateCandidateListLayout(prefix: "style")
-    vertical = config.updateTextOrientation(prefix: "style")
+    linear ?= config.getString("style/candidate_list_layout").map { $0 == "linear" }
+    vertical ?= config.getString("style/text_orientation").map { $0 == "vertical" }
     inlinePreedit ?= config.getBool("style/inline_preedit")
     inlineCandidate ?= config.getBool("style/inline_candidate")
     translucency ?= config.getBool("style/translucency")
@@ -219,6 +219,8 @@ final class SquirrelTheme {
       // the following per-color-scheme configurations, if exist, will
       // override configurations with the same name under the global 'style'
       // section
+      linear ?= config.getString("\(prefix)/candidate_list_layout").map { $0 == "linear" }
+      vertical ?= config.getString("\(prefix)/text_orientation").map { $0 == "vertical" }
       inlinePreedit ?= config.getBool("\(prefix)/inline_preedit")
       inlineCandidate ?= config.getBool("\(prefix)/inline_candidate")
       translucency ?= config.getBool("\(prefix)/translucency")