consider remappings for use config file option too

libs/remix-solidity/src/compiler/compiler.ts

@@ -215,7 +215,6 @@ export class Compiler {
           try {
             if (source && source.sources) {
               const { optimize, runs, evmVersion, language, remappings, useFileConfiguration, configFileContent } = this.state
-              console.log('remappings---->', remappings)
               if (useFileConfiguration) {
                 input = compilerInputForConfigFile(source.sources, JSON.parse(configFileContent))
               } else {
@@ -338,7 +337,10 @@ export class Compiler {
 
         try {
           if (useFileConfiguration) {
-            input = compilerInputForConfigFile(source.sources, JSON.parse(configFileContent))
+            let compilerInput = JSON.parse(configFileContent)
+            if (compilerInput.settings.remappings?.length) compilerInput.settings.remappings.push(...remappings)
+            else compilerInput.settings.remappings = remappings
+            input = compilerInputForConfigFile(source.sources, compilerInput)
           } else {
             input = compilerInput(source.sources, { optimize, runs, evmVersion, language, remappings })
           }

libs/remix-ui/solidity-compiler/src/lib/logic/compileTabLogic.ts

@@ -110,7 +110,7 @@ export class CompileTabLogic {
         const sources = { [target]: { content } }
         this.event.emit('removeAnnotations')
         this.event.emit('startingCompilation')
-        if(!this.useFileConfiguration && await this.api.fileExists('remappings.txt')) {
+        if(await this.api.fileExists('remappings.txt')) {
           this.api.readFile('remappings.txt').then( remappings => {
             this.compiler.set('remappings', remappings.split('\n'))
           })