Fix launcher startup bootstrap race

app/assets/js/scripts/uibinder.js

@@ -4,6 +4,7 @@
  */
 // Requirements
 const path          = require('path')
+const { LoggerUtil } = require('helios-core')
 const { Type }      = require('helios-distribution-types')
 
 const AuthManager   = require('./assets/js/authmanager')
@@ -12,6 +13,10 @@ const { DistroAPI } = require('./assets/js/distromanager')
 
 let rscShouldLoad = false
 let fatalStartupError = false
+let mainUiBootstrapStarted = false
+let mainUiBootstrapped = false
+
+const loggerUIBinder = LoggerUtil.getLogger('UIBinder')
 
 // Mapping of each view to their container IDs.
 const VIEWS = {
@@ -107,6 +112,28 @@ async function showMainUI(data){
     }, 750)
 }
 
+async function bootstrapMainUI(source){
+    if(mainUiBootstrapped || mainUiBootstrapStarted){
+        return
+    }
+
+    mainUiBootstrapStarted = true
+    loggerUIBinder.info(`Bootstrapping main UI from ${source}.`)
+
+    try {
+        const data = await DistroAPI.getDistribution()
+        syncModConfigurations(data)
+        ensureJavaSettings(data)
+        await showMainUI(data)
+        mainUiBootstrapped = true
+        loggerUIBinder.info(`Main UI bootstrap succeeded from ${source}.`)
+    } catch (error) {
+        loggerUIBinder.error(`Main UI bootstrap failed from ${source}.`, error)
+    } finally {
+        mainUiBootstrapStarted = false
+    }
+}
+
 function showFatalStartupError(){
     setTimeout(() => {
         $('#loadingContainer').fadeOut(250, () => {
@@ -422,11 +449,14 @@ document.addEventListener('readystatechange', async () => {
         if(rscShouldLoad){
             rscShouldLoad = false
             if(!fatalStartupError){
-                const data = await DistroAPI.getDistribution()
-                await showMainUI(data)
+                await bootstrapMainUI('readystatechange-event')
             } else {
                 showFatalStartupError()
             }
+        } else if(document.readyState === 'complete' && !fatalStartupError){
+            setTimeout(() => {
+                bootstrapMainUI('readystatechange-fallback')
+            }, 0)
         } 
     }
 
@@ -435,11 +465,8 @@ document.addEventListener('readystatechange', async () => {
 // Actions that must be performed after the distribution index is downloaded.
 ipcRenderer.on('distributionIndexDone', async (event, res) => {
     if(res) {
-        const data = await DistroAPI.getDistribution()
-        syncModConfigurations(data)
-        ensureJavaSettings(data)
         if(document.readyState === 'interactive' || document.readyState === 'complete'){
-            await showMainUI(data)
+            await bootstrapMainUI('distributionIndexDone')
         } else {
             rscShouldLoad = true
         }