mustcanbedo commented on code in PR #21201:
URL: https://github.com/apache/echarts/pull/21201#discussion_r2384426176


##########
src/model/Global.ts:
##########
@@ -1039,7 +1035,9 @@ function mergeTheme(option: ECUnitOption, theme: 
ThemeOption): void {
             if (typeof themeItem === 'object') {
                 option[name] = !option[name]
                     ? clone(themeItem)
-                    : merge(option[name], themeItem, false);
+                    : preserveUserOptions
+                        ? merge(themeItem, option[name], false) // User 
options have higher priority

Review Comment:
   > > So it seems that if we need to solve this problem now
   > 
   > Could you explain the original scenario where you need to use setTheme 
while keeping data? I’d like to determine whether this usage is appropriate.
   The most basic requirement comes from this 
issue(https://github.com/apache/echarts/issues/21200 )
   
   



##########
src/model/Global.ts:
##########
@@ -1039,7 +1035,9 @@ function mergeTheme(option: ECUnitOption, theme: 
ThemeOption): void {
             if (typeof themeItem === 'object') {
                 option[name] = !option[name]
                     ? clone(themeItem)
-                    : merge(option[name], themeItem, false);
+                    : preserveUserOptions
+                        ? merge(themeItem, option[name], false) // User 
options have higher priority

Review Comment:
   The most basic requirement comes from this 
issue(https://github.com/apache/echarts/issues/21200 )



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