fix switching to a github file from the solidity warning

apps/remix-ide-e2e/src/tests/solidityImport.test.ts

@@ -58,6 +58,20 @@ module.exports = {
           .addFile('Untitled7.sol', sources[6]['browser/Untitled7.sol'])
           .clickLaunchIcon('fileExplorers')
           .verifyContracts(['test11', 'ERC20', 'SafeMath'], {wait: 10000})            
+  },
+  
+  'Test switch to a github import from a solidity warning': function (browser: NightwatchBrowser) {
+    browser
+          .setSolidityCompilerVersion('soljson-v0.7.4+commit.3f05b770.js')
+          .addFile('Untitled8.sol', sources[7]['browser/Untitled8.sol'])
+          .clickLaunchIcon('fileExplorers')
+          .clickLaunchIcon('solidity')
+          .waitForElementPresent('[data-id="compiledErrors"] div:nth-child(3)')
+          .click('[data-id="compiledErrors"] div:nth-child(3)') // select the second warning which point to ERC20 code
+          .getEditorValue((content) => {
+            browser.assert.ok(content.indexOf(`contract ERC20 is Context, IERC20`) != -1, 
+          'current displayed content should be from the ERC20 source code')
+          })     
           .end()          
   },
   tearDown: sauce
@@ -85,5 +99,8 @@ const sources = [
   },
   {
     'browser/Untitled7.sol': {content: 'import "https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-contracts/master/contracts/token/ERC20/ERC20.sol"; contract test11 {}'}
+  },
+  {
+    'browser/Untitled8.sol': {content: 'import "https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-contracts/master/contracts/token/ERC20/ERC20.sol"; contract test12 {}'}
   }
 ]

apps/remix-ide/src/app/ui/renderer.js

@@ -81,18 +81,24 @@ Renderer.prototype.error = function (message, container, opt) {
     text = message.innerText
   }
 
-  var errLocation = text.match(/^([^:]*):([0-9]*):(([0-9]*):)? /)
-  if ((!opt.errFile || !opt.errCol || !opt.errLine) && errLocation) {
-    errLocation = parseRegExError(errLocation)
-    opt.errFile = errLocation.errFile
-    opt.errLine = errLocation.errLine
-    opt.errCol = errLocation.errCol
-  }
+  // ^ e.g:
+  // browser/gm.sol: Warning: Source file does not specify required compiler version! Consider adding "pragma solidity ^0.6.12
+  // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v3.2.0/contracts/introspection/IERC1820Registry.sol:3:1: ParserError: Source file requires different compiler version (current compiler is 0.7.4+commit.3f05b770.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
+
+  // extract line / column
+  let position =  text.match(/^(.*?):([0-9]*?):([0-9]*?)?/)
+  opt.errLine = position ? position[2] : -1
+  opt.errCol = position ? position[3] : -1
+    
+
+  // extract file
+  position = text.match(/^(https:.*?|http:.*?|.*?):/)
+  opt.errFile = position ? position[1] : ''
   
-  if (!opt.noAnnotations && errLocation) {
-    this._error(errLocation.errFile, {
-      row: errLocation.errLine,
-      column: errLocation.errCol,
+  if (!opt.noAnnotations && opt.errFile) {
+    this._error(opt.errFile, {
+      row: opt.errLine,
+      column: opt.errCol,
       text: text,
       type: opt.type
     })
@@ -107,7 +113,7 @@ Renderer.prototype.error = function (message, container, opt) {
   $error.click((ev) => {
     if (opt.click) {
       opt.click(message)
-    } else if (opt.errFile && opt.errLine && opt.errCol) {
+    } else if (opt.errFile !== undefined && opt.errLine !== undefined && opt.errCol !== undefined) {
       this._errorClick(opt.errFile, opt.errLine, opt.errCol)
     }
   })
@@ -123,7 +129,7 @@ function parseRegExError (err) {
   return {
     errFile: err[1],
     errLine: parseInt(err[2], 10) - 1,
-    errCol: err[4] ? parseInt(err[4], 10) : 0
+    errCol: err[3] ? parseInt(err[3], 10) : 0
   }
 }